The outer planets

Orbits and sizes are not shown to scale. NASA A gas giant is a large planet composed mostly of gases, such as hydrogen and helium, with a relatively small rocky core.

The outer planets

March 29, Orbits and sizes are not shown to scale. NASA A gas giant is a large planet composed mostly of gases, such as hydrogen and helium, with a relatively small rocky core.

The Outer Planets:

The gas giants of our solar system are Jupiter, Saturn, Uranus and Neptune. These four large planets, also called jovian planets after Jupiter, reside in the outer part of the solar system past the orbits of Mars and the asteroid belt.

Jupiter and Saturn are substantially larger than Uranus and Neptune, and each pair of planets has a somewhat different composition.

Although there are only four large planets in our solar system, astronomers have discovered thousands outside of it, particularly using NASA's Kepler Space Telescope. These exoplanets as they are called are being examined to learn more about how our solar system came to be.

Basic facts Jupiter is the largest planet in our solar system. It has a radius almost 11 times the size of Earth. It The outer planets 50 known moons and 17 waiting to be confirmed, according to NASA. The planet is mostly made of hydrogen and helium surrounding a dense core of rocks and ice, with most of its bulk likely made up of liquid metallic hydrogen, which creates a huge magnetic field.

Jupiter is visible with the naked eye and was known by the ancients. Its atmosphere consists mostly of hydrogen, helium, ammonia and methane.

It has 53 known moons and nine more awaiting confirmation, according to NASA. Like Jupiter, it is mostly made up of hydrogen and helium that surround a dense core and was also tracked by ancient cultures.

Outer planets - Wikipedia

Its atmosphere is similar to Jupiter's. It is the only planet tilted on its side, and it also rotates backward relative to every planet but Venus, implying a huge collision disrupted it long ago.

The planet has 27 moons, and its atmosphere is made up of hydrogen, helium and methane, according to NASA. It was discovered by William Herschel in Like Uranus, its atmosphere is mostly made up of hydrogen, helium and methane.

It has 13 confirmed moons and an additional one awaiting confirmation, according to NASA. It was discovered by several people in Scientists have found a multitude of "super-Earths" planets between the size of Earth and Neptune in other solar systems. There are no known super-Earths in our own solar system, although some scientists speculate there may be a "Planet Nine" lurking in the outer reaches of our solar system.

Scientists are studying this category of planets to learn whether super-Earths are more like small giant planets or big terrestrial planets.

Formation and similarities Astronomers think the giants first formed as rocky and icy planets similar to terrestrial planets. However, the size of the cores allowed these planets particularly Jupiter and Saturn to grab hydrogen and helium out of the gas cloud from which the sun was condensing, before the sun formed and blew most of the gas away.

Since Uranus and Neptune are smaller and have bigger orbits, it was harder for them to collect hydrogen and helium as efficiently as Jupiter and Saturn.

Outer Planet Exploration

This likely explains why they are smaller than those two planets. On a percentage basis, their atmospheres are more "polluted" with heavier elements such as methane and ammonia because they are so much smaller.Outer Planet Exploration. In , Pioneer 10 became the first spacecraft to visit one of the outer planets.

Pioneer 10 would be the first of many spacecraft to journey beyond the asteroid belt. The Solar System is the gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly, including the eight planets and five dwarf planets as defined by the International Astronomical Union (IAU).

Of the objects that orbit the Sun directly, the largest eight are the planets, with the remainder being smaller objects, such as dwarf planets and small Solar. An Introduction In our solar system, nine planets circle around our Sun sits in the middle while the planets travel in circular paths (called orbits) around nine planets travel in the same direction (counter- clockwise looking down from the Sun's north pole).

The VHS was released as a gift set in 87, and a couple of times since as a stand alone VHS before the extended DVD in As an early Don Barrett production, it lacks some of the better CGI of later films.

The planets of the solar system as depicted by a NASA computer illustration. Orbits and sizes are not shown to scale. Credit: NASA A gas giant is a large planet composed mostly of gases, such as. Outer Planets. The next four planets out from the sun are Jupiter, Saturn, Uranus, and Neptune.

They are collectively referred to as the Jovian planets (means Jupiter like). They are significantly different from the terrestrial planets.

The outer planets
The Galilean Moons of Jupiter