Some asteroids and moons have a similar structure to terrestrial planets, such as rocky asteroid Vesta (one of the largest in. It lies in the habitable zone of its parent star. Other ESI values that have been reported by third parties include the following sources:[7][4], Although the ESI does not characterize habitability, given the point of reference is the Earth, some of its functions match those used by habitability measures. That is the 1 million Euro question. The stars TESS studiesare 30 to 100 times brighter than those the Kepler mission and K2 follow-up surveyed, enabling far easier follow-up observations with both ground-based and space-based telesc Like ancient explorers who looked to the stars to guide them to new worlds, astronomers today use stars to discover worlds many light years beyond our solar system. Venus is the second planet from the sun and is the hottest planet in the solar system. Kepler's Third Law: The movement of solar system planets. Adapted from: https://www.youtube.com/watch?v=GDgbVIqGADQ:Original paper: https://physicstoday.scitation.org/do/10.1063/PT.6.3.20190312a/full/My thoughts: h. Science NASA: This planet is the closest thing to Earth yet Data from the Kepler Space Telescope reveals a planet that hits the triumvirate of being just right: It's the right size in the. 1 hit when it topped the Billboard Hot 100 chart in 1959. This is because Uranus and Neptune have more atmospheric water and other ice-forming molecules, such as methane, hydrogen sulfide and phosphene, that crystallize into clouds in the planets' frigid conditions, according to the Planetary Society. As a result, one of WASP-121 b's hemispheres. The exoplanet is considered one of the best suitable candidates for future earth. Scientists explain (video), Watch SpaceX launch 48 Starlink satellites today. Discover the wonders of the solar system with this educational material from ESA. Earth, Mars, and Mercury also have water. See where the planets are in their current orbit of the sun with this interactive orrery from NASA. 1 hit in the U.S. with their cover of the song. Overview | Mercury - NASA Solar System Exploration Why is earth closest to the sun in January? Irregularities in the orbit of Uranus led French astronomer Alexis Bouvard to suggest some other planet might be exerting a gravitational tug. Yep, Mercury. The alleged "Planet Nine," also called "Planet X," is believed to be about 10 times the mass of Earth and 5,000 times the mass of Pluto. Jupiter: The largest planet in our solar system. Substantial scientific evidence suggests that Mars at one point billions of years ago was a much warmer, wetter world, rivers and maybe even oceans existed. It's an airless world, so you'd need a spacesuit. Learn more about how to use the basic functions of Eyes on Exoplanets. It is known to be a water world. And in the Disney animated film The Princess and the Frog, Ray the firefly falls in love with Venus, the evening star, as he has mistaken it for another firefly. Venus has a solid surface covered in dome-like volcanoes, rifts, and mountains, with expansive volcanic plains and vast, ridged plateaus. Earth analog - Wikipedia Neptune's winds travel at more than 1,500 mph, and are the fastest planetary winds in the solar system. It was discovered on 23rd July 2015. Its radius is 1.7 times more that of Earth. - Named for the Roman goddess of love and beauty. In our solar system, the four inner planets are all categorized as terrestrial. Scientists have announced that samples collected by Curiosity are rich in a type of carbon associated with biological processes on Earth. It is open to visitors from 8:30 a.m. to 5:30 p.m. EDT each Monday through Friday. Kepler-22b is an exoplanet located 600 light years away from us confirmed in December 2011. This infrared data from NASA's Spitzer Space Telescope tells astronomers that a distant gas planet, a so-called "hot Jupiter" called HD 209458b, might be smothered with high clouds. The TRAPPIST-1e is most likely similar to earth in terms of size, mass and temperature. On July 6, at aphelion, Earth will be 1.01 AU from the sun, according to astronomer Fred Espenak . The mean temperatures of planets in our solar system are: Mercury - 333F (167C) Venus - 867F (464C) Earth - 59F (15C) Mars - Minus 85F (-65C) Jupiter - Minus 166F (-110C) Saturn - Minus 220F (-140C) Uranus - Minus 320F (-195C) Neptune - Minus 330F (-200C) Dwarf Planet Pluto - Minus 375F (-225C) But there is a doubt in the existence of the planet. The index can be calculated for objects other than planets, including natural satellites, dwarf planets and asteroids. But until that happens, sending instruments there is crucial to learning more about Mars. Our Solar System | NASA Solar System Exploration The Earth Similarity Index ( ESI) is a proposed characterization of how similar a planetary-mass object or natural satellite is to Earth. Knowing this, do any other planets move closer to Earth than Venus? Those planets are quite similar to our planet Earth. What is the closest planet to Earth? The 2011 Astrobiology article and the ESI values found in it received press attention at the time of the article's publication. Space is part of Future US Inc, an international media group and leading digital publisher. Venus is the second closest planet to the Sun, orbiting at a distance of about 67 million miles (108 million kilometers). The Earth orbits the sun at an average distance of 93-million miles (150-million kilometres), a distance astronomers refer to as an astronomical unit. Kepler-452b has a probable mass five times that of Earth, and its surface gravity is nearly twice as much as Earth's, though calculations of mass for exoplanets are only rough estimates. The Greeks believed Venus was two different objects one in the morning sky and another in the evening. An American probe, one of NASA's Pioneer Venus Multiprobes, survived for about an hour after impacting the surface in 1978. Dazzling 'shooting stars' discovered in the sun's atmosphere. It is actually scorching, with an average temperature of 2780F (1500C), something that happens because it is very close to its star so close that it takes about 18 hours for the planet to complete a full rotation around its host star. The webpage also ranks what it describes as the habitability of planets and moons according to three criteria: the location in the habitable zone, ESI, and a speculation as to a capacity to sustain organisms at the bottom of the food chain, a different index collated on the webpage identified as the "Global Primary Habitability scale".[6]. The exoplanet is located 1400 light years away from us in the Cygnus Constellation. Because the water in oceans of this planet is vaporized into sky due to high temperature. .css-v1xtj3{display:block;font-family:FreightSansW01,Helvetica,Arial,Sans-serif;font-weight:100;margin-bottom:0;margin-top:0;-webkit-text-decoration:none;text-decoration:none;}@media (any-hover: hover){.css-v1xtj3:hover{color:link-hover;}}@media(max-width: 48rem){.css-v1xtj3{font-size:1.1387rem;line-height:1.2;margin-bottom:1rem;margin-top:0.625rem;}}@media(min-width: 40.625rem){.css-v1xtj3{line-height:1.2;}}@media(min-width: 48rem){.css-v1xtj3{font-size:1.18581rem;line-height:1.2;margin-bottom:0.5rem;margin-top:0rem;}}@media(min-width: 64rem){.css-v1xtj3{font-size:1.23488rem;line-height:1.2;margin-top:0.9375rem;}}The 10 Most Extreme Survival Stories, Few Know of the Most Destructive Volcano in Italy, Defense Contractors May Be Teasing New Fighters, Why the Marines Are Ditching Tanks and Howitzers, How Some Animals Can Survive a Nuclear Disaster, I Tried to Learn Woodworking Through ChatGPT, How M.C. Surprise, Its Mercury, Earth to Neptune in One Year? The planet is more than 30 times as far from the sun as Earth. Brown, Michael E., and Konstantin Batygin. Visit our corporate site. Also called trans-Neptunian objects, these Kuiper Belt objects have highly elliptical or oval orbits that align in the same direction. Right now, Jupiter has the most named moons50. Venus is sometimes called Earths twin because its similar in size and structure, but the planets are very different in other ways. This planet was discovered by Elisa Quintana on 17th April 2014. In 2021, there are 4843 confirmed exoplanets. Save my name, email, and website in this browser for the next time I comment. They're also mostly made of gases like hydrogen, helium and ammonia rather than of rocky surfaces, although astronomers believe some or all of them may have solid cores. Of the two, Venus comes closer to the Earth than any other. Mars shares similarities with Earth: It is rocky, has mountains, valleys and canyons, and storm systems ranging from localized tornado-like dust devils to planet-engulfing dust storms. But it might actually be Mercury. It has a thin atmosphere, and it doesn't have any moons. We depend upon all the things we get from Earth. But there are terrestrial exoplanets, too. Due to its proximity to the central star, the planet's rotation is tidally locked to its orbit around it. It orbits around red dwarf Kepler star. Since planets orbit the sun in elliptical orbits, the distance between them, the sun, and other planets changes during the course of their orbit. By Elizabeth Landau, CNN. June 28, 2023. Here are ten mysteries of Venus that NASA scientists are still grappling with. However, the name Earth is a Germanic word, which simply means "the . More than 40 years later, Christiaan Huygens proposed that they were rings. Surprisingly, they found that Mercury was the closest planet to all seven other planets. (Image credit: NASA, ESA, STScI, A. Simon (Goddard Space Flight Center), M.H. An innovative calculation provides a better way to think about our solar system. Perihelion and aphelion were first noticed in the 17th century by astronomer Johannes Kepler, who . Low gravity is bad news for your bones, which will lose mass and become brittle.. Here, below we have mentioned 10 earth like planets that could be the future earth. What's the Closest Planet to Earth? Not Venus, Scientists Say All terrestrial planets in our solar system actually have a metallic core, mostly made of iron, and a silicate shell with a mantle and a crust. Venus is sometimes referred to as Earth's twin as they are similar in size and radar images beneath its atmosphere reveal numerous mountains and volcanoes. Kepler 452 is a sun-like star that wanders through the cosmos some 1,400 light-years from Earth. - Name originates from "Die Erde," the German word for "the ground.". Earth has one. Physical characteristics Mass, radius and temperature Size comparison between Kepler-452b and Earth, along with the similarities of their parent stars. Venus is located at an average distance of 42-million miles (67-million kilometres) from Earth, yet that distance actually varies depending on where both planets are in their orbit. ", But most people would still say that their closest neighbors are the ones who live immediately next door for the rest of the year, Beckwith told Live Science. ", Science Writer: The order of the planets in the solar system, starting nearest the sun and working outward is the following: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and then the possible Planet Nine. Common sense would say the answer is either .css-3wjtm9{-webkit-text-decoration:underline;text-decoration:underline;text-decoration-thickness:0.125rem;text-decoration-color:#1c6a65;text-underline-offset:0.25rem;color:inherit;-webkit-transition:all 0.3s ease-in-out;transition:all 0.3s ease-in-out;}.css-3wjtm9:hover{color:#595959;text-decoration-color:border-link-body-hover;}Mars or Venus, our next-door neighbors. Uranus is the seventh planet from the sun and is a bit of an oddball. Now we are going to discuss some of the planets which has been discovered in the interstellar space similar to Earth. Some of the moons of these planets are giving sign of life in the upcoming millions of years. We are currently just exploring what processes drive the formation and evolution of other solar systems, and what we can learn from this about our own solar systems (and Earths!) Related: How long does it take to get to Mars? Related: How much of the solar system is made of interstellar stuff? Texas A&M atmospheric scientist Dr. John Nielsen-Gammon explains. The planet's average temperature hit 17.23 degrees Celsius on Thursday, surpassing the 17.18C record set on Tuesday and equalled on Wednesday. The outer core remains liquid, enveloping the solid inner core . Some stars may have 8, others may have none. More recent Venus missions include ESAs Venus Express (which orbited from 2006 until 2016) and Japans Akatsuki Venus Climate Orbiter (orbiting since 2016). In 2021, Daisy completed a PhD in plant physiology and also holds a Master's in Environmental Science, she is currently based in Nottingham, U.K. Hungry black hole 'switches on' as astronomers watch in surprise, What would it be like to walk on an asteroid? It's a little bigger than Earth's Moon. [2] ESI was also referenced in an article published in Revista Cubana de Fsica. [3], For exoplanets, in almost every case only the planet's orbital period along with either the proportional dimming of the star due to the planet's transit or the radial velocity variation of the star in response to the planet is known with any degree of certainty, and so every other property not directly determined by those measurements is speculative. For example, with the transit method, measurement of radius can be highly accurate, but mass and density are often estimated. It sheds most of the heat and light that makes life possible on Earth and possibly elsewhere. Apparently, this calculation had never been done before. The Earth Information Center is both a physical space and a web-based experience drawing on research conducted by teams at NASA's different centers, at academic institutions, and by industry partners. In 1986, British pop group Bananarama had a No. To view them, you must be in "Slide Show" mode; you can then move to the next view either by clicking your mouse, the spacebar, or the arrow keys. Related: There's something strange going on inside Neptune. But what is even more, some of these other solar systems actually have not one, but two or more stars (like Tatooine!) Surface temperatures on Venus are about 900 degrees Fahrenheit (475 degrees Celsius) hot enough to melt lead. It is smaller than Earth's moon; its orbit is highly elliptical, falling inside Neptune's orbit at some points and far beyond it at others; and Pluto's orbit doesn't fall on the same plane as all the other planets instead, it orbits 17.1 degrees above or below. Not only is the planet similar to Earth, but also it seems possible to go there, Christensen said. Prialnik, Dina K., Antonella Barucci, and Leslie Young, eds. The planet is pictured here as seen by NASA's MESSENGER spacecraft. As the exoplanet gets 2000 times more Stellar Winds from its parent star in comparison to earth. Earth one of the planets of the solar system.Earth is very unique planet because it has life on it. That is probably the reason why Jupiter and Saturn have rings of dust and debris around them. [See Photos of Meteorites from Around the World]. Approximately 4.5 billion years ago a dark cloud of gas and dust began to collapse. Terrestrial planets are Earth-like planets, structure-wise. The planet zips around the sun at more than 18 miles per second (29 km per second). Also, it is about 1.6 times the size of earth. Even though Mercury is closer to the Sun, Venus is the hottest planet in our solar system. (Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie ). This site is maintained by the Planetary Science Communications team at, Venus' Squishy' Outer Shell May Be Resurfacing the Planet, National Space Science Data Center - Venus, National Space Science Data Center Photo Gallery - Venus, What Sounds Captured by NASA's Perseverance Rover Reveal About Mars, Cosmic Milestone: NASA Confirms 5,000 Exoplanets, NASA's Perseverance Rover Hightails It to Martian Delta, NASA Telescope Spots Highest-Energy Light Ever Detected From Jupiter, Parker Solar Probe Captures its First Images of Venus' Surface in Visible Light, NASA Planes Fly into Snowstorms to Study Earth's Snowfall, NASA's MRO Finds Water Flowed on Mars Longer Than Previously Thought, NASA's Curiosity Rover Measures Intriguing Carbon Signature on Mars, January 2022: The Next Full Moon is the Wolf Moon, or Ice Moon, 10 Things to Watch for in Planetary Science for 2022, NASA's Curiosity Rover Sends a Picture Postcard From Mars, NASA's Lunar Reconnaissance Orbiter Images Saturn, Hubble's Grand Tour of the Outer Solar System, Meet VMS the Briefcase-Sized Chemistry Lab Headed to Venus, NASA's Juno: Science Results Offer First 3D View of Jupiter Atmosphere, NASA's Perseverance Sheds More Light on Jezero Crater's Watery Past, NASA's InSight Finds Three Big Marsquakes, Thanks to Solar-Panel Dusting, NASA's Webb to Explore Forming Planetary Systems, NASA Finds 2021 Arctic Summer Sea Ice 12th-Lowest on Record. Venus is hotter. It completes its one Orbit in approximately 130 days. It orbits around Kepler-22 star. It may take between 10,000 and 20,000 Earth years to make one full orbit around the Sun. What is accretion, and how did it form the Earth? NASA: This planet is the closest thing to Earth yet - CNET Or at least, it's the closest on average. A team is tracking storms across parts of the U.S. in two NASA planes to help understand the inner workings of winter storms. By measuring the depth of the dip in brightness and knowing the size of the star, scientists can determine the size or radius of the planet. Jovian planets are very massive. Why Do We Need Exercise Benefits of Exercise, [] This is all about space startup, if you are excited to know more about habitable planets like earth, please check out this article here [], Your email address will not be published. The solar system extends from the sun, goes past the four inner planets, through the asteroid belt to the four gas giants and on to the disk-shaped Kuiper Belt and far beyond to the teardrop-shaped heliopause. Find out in this animation narrated by Dr. Nick Siegler, Technology Manager of the NASA Exoplanet Exploration Program. Because the atmosphere is so thin it cannot incoming meteors, its surface is therefore pockmarked with craters, just like our moon. Pirani, Simona, et al. Source: Johns Hopkins APL, Mike Yakovlev/Wikimedia Commons. It also has 13 sets of faint rings. Neptune was the first planet predicted to exist by using math, rather than being visually detected. The gas giant is more than twice as massive as all the other planets combined, according to NASA. The ESI, as proposed in 2011 by Schulze-Makuch et al. Earth is the largest terrestrial planet in the solar system. Mercury's atmosphere is very thin and primarily composed of oxygen, sodium, hydrogen, helium and potassium. {\displaystyle x_{i0}} i Venus and Earth are about the same size, Earth being slightly larger. The Solar System Planet Sizes Mercury - 1,516mi (2,440km) radius; about 1/3 the size of Earth Venus - 3,760mi (6,052km) radius; only slightly smaller than Earth Earth - 3,959mi (6,371km) radius Mars - 2,106mi (3,390km) radius; about half the size of Earth Jupiter - 43,441mi (69,911km) radius; 11x Earth's size around the world. What's the Closest Planet to Earth? Surprise, It's Mercury Short for Venus Mass Spectrometer, VMS is one of five instruments aboard the DAVINCI descent probe. Venus is most like Earth in terms of mass and size, and it is also the planet closest to Earth, but the two planets are far from identical twins. Kepler 452b is an exoplanet which orbits a G2 type star and is located in the habitable zone whose mass it can hold liquid water on its surface. If there is any presence of the atmosphere then the heat it can be transferred to the other black side which makes it more habitable. is the total number of properties. history. - Number of moons: 79 (53 confirmed, 26 provisional). The Earth is the third closest planet to the Sun, however, there are two planets that could constitute as being the closest to Earth. Kepler-22b was discovered on 5 December 2011. Informational Guides / By Gordon Watts There are 8 planets in our solar system, with some a lot larger than others. It belongs to the class of hot Jupiters. But as an article in Physics Today points out, over half the time Venus is not the nearest planet; Mercury is. Venus has thousands more volcanoes than we thought, and they might be active, Rare red asteroids around Neptune could reveal the secrets of the early solar system. There are four terrestrial planets in our solar system, and billions of them are outside our solar system. The camera aboard NASAs Lunar Reconnaissance Orbiter (LRO) spacecraft imaged Saturn on Oct. 13, 2021. Phil Davis & Steve Carney Proxima Centauri is located just 4.25 light years away from us. And it is assumed that the exoplanet has cloudy skies and a warm temperature. The analysis of the first three years of Kepler data have revealed more than 3,600 candidate worlds. The closest planet to Earth in our solar system is the planet Venus, yet sometimes Mercury may also be closer. In 2017, NASA discovered seven terrestrial planets orbiting TRAPPIST-1, an ultra-cool red dwarf star in the constellation Aquarius, about 40 light-years from Earth. Although Mars' atmosphere is too thin for liquid water to exist on the surface for any length of time, remnants of that wetter Mars still exist today. For millennia, astronomers have followed points of light that seemed to move among the stars. That still didn't quite fit because it was so much larger (and rounder) than the other asteroids. The problem with Pluto, aside from its small size and offbeat orbit, is that it doesn't clear its neighborhood of debris it shares its space with lots of other objects in the Kuiper Belt. Types of planets under the Geophysical Planet Definition (GPD). The lander cleared enough dust from one solar panel to keep its seismometer on through the summer, allowing scientists to study three big quakes. (Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute), Planet Nine: A planet search at solar system's edge, The hypothesized Planet Nine is estimated to be about 10 times the mass of Earth, (Image credit: ESO/Tom Ruen/nagualdesign), 10 incredible volcanoes in our solar system, 15 stunning places on Earth that look like they're from another planet, according to the U.S. National Library of Medicine, Characterising Exoplanet Satellite (CHEOPS) mission, Kepler's Third Law: The movement of solar system planets. An artists impression of a transiting exoplanet, named 'HD 189733b' - the first exoplanet found to have water vapor in its atmosphere. All across the Milky Way, dying stars are gobbling up their planets. Neptune is approximately the same size as Uranus and is known for its supersonic strong winds. When people calculate the distance between two planets, they usually subtract the two planets' average distances from the sun. Kepler-452b - Wikipedia There are eight planets in our solar system but none of them are habitable for us. Scientists estimate that the edge of the solar system is about 9 billion miles (15 billion kilometers) from the sun. The greenhouse effect makes Venus roughly 700F (390C) hotter than it would be without a greenhouse effect. This slide shows how dramatically different the planets in our solar system are in size. See also the list of 10 Upcoming Space Events. What are they really? And since often we find multiple of them orbiting the same star, we can count about 4,000 other solar systems. The 'Forbidden Planet' That Escaped a Fiery Doom The KOI 7711.01 is another candidate to host life. This artist's conception illustrates Kepler-22b, a planet known to comfortably circle in the habitable zone of a sun-like star. Our planet offers us a habitable environment. Pat Brennan Which Planet Is Closest To Earth? Ok, Now Guess Again. [9] What if Planet 9 is a primordial black hole? [1], A webpage maintained by one of the authors of the 2011 Astrobiology article, Abel Mndez at the University of Puerto Rico at Arecibo, lists his calculations of the index for various exoplanetary systems. The heat and pressure eventually became so high that hydrogen atoms began to combine to form helium. But beyond that, the planets could not be more different. The Earth Similarity Index (ESI) is a proposed characterization of how similar a planetary-mass object or natural satellite is to Earth. Most followed volleyball player in the world, Top 10 Most Famous Pirate Ships of All Time, Top 10 Notorious Female Pirates in History, Top 10 Most Beautiful Women in The World 2023, Zehra Gunes: A Volleyball Powerhouse with a Trail of Honors. Earth rotates on its axis at 1,532 feet per second (467 meters per second) slightly more than 1,000 mph (1,600 kph) at the equator. In the commentary, the researchers devised a new mathematical technique, called the point-circle method, to measure the distances between planets. Some of them are: Kepler-186f In 2014, NASA's Kepler Space Telescope discovered the first Earth-sized world in the habitable zone of another star. It was designed to be a scale from zero to one, with Earth having a value of one; this is meant to simplify planet comparisons from large databases. "Observational constraints on the orbit and location of planet nine in the outer solar system." The planet is supposed to be tidally locked to its parent star and one side might be freezing cold and the other side extremely hot. Artist's impression of the planetary system around the red dwarf Gliese 581. TRAPPIST-1e has 93% surface gravity of earth and is probably known to support liquid water and terrestrial life. The rings are made of ice and rock and scientists are not yet sure how they formed. The answer most people would give is Venus. What planet has a similar size as Earth? | Socratic Proxima Centauri B is known to be the earth like planets but the chances of maintaining life on the planet is slim. The other planets in the solar system are known to be completely water worlds or covered with thick Ice sheets. Kepler-22b is exo planet in Cygnus constellation. The sun accumulated about 99% of the available matter and the remaining material further from the sun formed smaller clumps inside the spinning disk. Its so hot on Venus, the metal lead would melt. The planet is estimated to be about 10 times the mass of Earth and to orbit the sun between 300 and 1,000 times farther than the orbit of the Earth. The physical space is in the east lobby of NASA Headquarters. In Depth | Hypothetical Planet X - NASA Solar System Exploration Earth shatters heat records, faces uncharted extreme weather - The However, not everyone agrees with this new definition of "closest" planet. Mosaic of the Valles Marineris hemisphere of Mars. Venus is an unlikely place for life as we know it, but some scientists theorize microbes might exist high in the clouds where its cooler and the pressure is similar to Earths surface. Yasemin is a staff writer at Live Science, covering health, neuroscience and biology. Apart from this, Mercury and Mars do not have a protective, breathable atmosphere like Earth's, and Venus has an extremely dense and toxic one. Other leftover pieces became asteroids, comets and smaller moons that make up our solar system. A recent 2022 sky survey using the 6-meter Atacama Cosmology Telescope (ACT) in Chile found thousands of tentative candidate sources but none could be confirmed. What's Causing Earth's Hottest Days To Date And What Does It Mean For These rocky, Earth-size worlds could contain surface water in different physical states depending on their distance from their host star. Like how the distance between Earth and Venus changes, the distance between the sun and Venus also changes. Astronomers continue to come up empty in their search for Planet 9. Theoretically, the gravitational forces of the Jovian planets could also lead them to destroy their own moons, as well as comets and asteroids passing by. Apparently even NASA is wrong about which planet is closest to Earth Mars and Mercury are much smaller than Earth and the other planets are much larger. ability to protect itself) which are among the keys to habitable surface conditions. Not only that, but Mercury was also the closest planet to Saturn, and Neptune, and all of the other planets. Overview | Earth - NASA Solar System Exploration