In our Solar System, astronomers regularly divide the planets into two teams — the inner planets and also the outer planets. The inner planets are closer to the Sun and are smaller and also rockier. The external planets are even more ameans, bigger and consisted of largely of gas.

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The inner planets (in order of distance from the sunlight, closest to furthest) are Mercury, Venus, Earth and Mars. After an asteroid belt comes the outer planets, Jupiter, Sarevolve, Uranus and Neptune. The amazing thing is, in some other planetary devices found, the gas giants are actually rather cshed to the sun.

This makes predicting how our Solar System developed an interesting exercise for astronomers. Conventional wisdom is that the young Sun blew the gases into the outer fringes of the Solar System and that is why tright here are such huge gas giants tbelow. However before, some extrasolar units have actually “hot Jupiters” that orlittle bit cshed to their Sun.


The Inner Planets:

The 4 inner planets are referred to as terrestrial planets bereason their surdeals with are solid (and, as the name indicates, rather similar to Planet — although the term deserve to be misleading bereason each of the 4 has actually vastly different environments). They’re made up mostly of heavy metals such as iron and also nickel, and have actually either no moons or few moons. Below are brief descriptions of each of these planets based upon this indevelopment from NASA.

Mercury: Mercury is the smallest earth in our Solar System and also additionally the closest. It rotates slowly (59 Planet days) loved one to the time it takes to revolve roughly the sunlight (88 days). The world has no moons, however has actually a tenuous setting (exosphere) containing oxygen, sodium, hydrogen, helium and potassium. The NASA MESSENGER (MErcury Surconfront, Gap ENvironment, GEochemistry, and also Ranging) spacecraft is currently orbiting the world.

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The terrestrial planets of our Solar System at around family member sizes. From left, Mercury, Venus, Earth and Mars. Credit: Lunar and also Planetary Institute

Venus: Venus was once thought about a twin world to Earth, till astronomers uncovered its surconfront is at a lead-melting temperature of 900 degrees Fahrenheit (480 levels Celsius). The earth is additionally a sluggish rotator, via a 243-day long Venusian day and an orbit roughly the sun at 225 days. Its atmosphere is thick and contains carbon dioxide and also nitrogen. The planet has no rings or moons and is currently being checked out by the European Space Agency’s Venus Expush spacecraft.


Earth: Earth is the only earth through life as we know it, yet astronomers have actually found some nearly Earth-sized planets exterior of our solar system in what could be habitable areas of their respective stars. It has an setting of nitrogen and oxygen, and also has actually one moon and no rings. Many type of spacecraft circle our world to administer telecommunications, weather information and various other services.

Mars: Mars is a world under intense research because it mirrors indicators of liquid water flowing on its surface in the prehistoric past. Today, yet, its atmosphere is a wispy mix of carbon dioxide, nitrogen and also argon. It has 2 tiny moons (Phobos and also Deimos) and no rings. A Mars day is slightly much longer than 24 Planet hrs and it takes the planet about 687 Earth days to circle the Sun. There’s a tiny fleet of orbiters and also rovers at Mars best now, consisting of the large NASA Curiosity rover that landed in 2012.

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The external planets of our Solar System at about family member sizes. From left, Jupiter, Sarotate, Uranus and Neptune. Credit: Lunar and Planetary Institute

The Outer Planets:

The external planets (sometimes called Jovian planets or gas giants) are astronomical planets swaddled in gas. They all have rings and also all of plenty of moons each. In spite of their dimension, just 2 of them are visible without telescopes: Jupiter and Sarevolve. Uranus and also Neptune were the first planets discovered considering that antiquity, and also verified astronomers the solar system was bigger than formerly believed. Below are brief descriptions of each of these planets based upon this information from NASA.


Jupiter: Jupiter is the biggest earth in our Solar System and spins very swiftly (10 Earth hours) relative to its orlittle bit of the sun (12 Earth years). Its thick atmosphere is mostly comprised of hydrogen and helium, probably neighboring a terrestrial core that is about Earth’s dimension. The planet has dozens of moons, some faint rings and a Great Red Spot — a raging storm happening for the previous 400 years at leastern (because we were able to view it with telescopes). NASA’s Juno spacecraft is en course and also will certainly visit tright here in 2016.

Saturn: Sarevolve is finest well-known for its prominent ring device — seven known rings through well-identified divisions and gaps between them. How the rings gained tbelow is one subject under investigation. It additionally has actually dozens of moons. Its environment is mainly hydrogen and also helium, and it also rotates conveniently (10.7 Planet hours) family member to its time to circle the Sun (29 Earth years). Sarotate is currently being checked out by the Cassini spacecraft, which will fly closer to the planet’s rings in the coming years.

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Near-infrared views of Uranus reveal its otherwise faint ring system, highlighting the level to which it is tilted. Credit: Lawrence Sromovsky, (Univ. Wisconsin-Madison), Keck Observatory.

Uranus: Uranus was first found by William Herschel in 1781. The planet’s day takes around 17 Earth hours and one orlittle about the Sun takes 84 Planet years. Its mass contains water, methane, ammonia, hydrogen and also helium neighboring a rocky core. It has actually dozens of moons and a faint ring device. Tbelow are no spacecraft slated to visit Uranus right now; the last visitor was Voyager 2 in 1986.


Neptune: Neptune is a remote world that contains water, ammmonia, methane, hydrogen and helium and a possible Earth-sized core. It has more than a dozen moons and six rings. The only spacecraft to ever before visit it was NASA’s Voyager 2 in 1989.

See more: At What Ph Did You See The Highest Activity Of Salivary Amylase

To learn even more about the planets and also missions, inspect out these links:

Solar System Exploration: Planets (NASA)NASA Photojournal (NASA)Missions (NASA)Space Science (European Gap Agency)USGS Astrogeology (UNITED STATE Geological Survey)The Solar System And Its Planets (European Void Agency)


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CategoriesAstronomy, Guide to Void TagsPlanet, inner planets, Jupiter, Mars, Mercury, Neptune, external planets, Saturn, Uranus, Venus

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