17. How big is Uranus?

Uranus has a diameter of 50,000 kilometres, a little less than 4 times the diameter of the Earth. The mass of Uranus is 15 times the mass of the Earth.

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18. How far from the Sun is Uranus?

The mean distance of Uranus from the Sun is 2,900,000,000 kilometres.

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19. How fast does Uranus travel around the Sun?

Uranus revolves at 6.8 kilometres per second.

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20. How long is the year on Uranus?

Uranus takes 84 years and 7 days to make one revolution about the Sun.

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21. Does Uranus have an atmosphere?

Uranus, like Jupiter and Saturn, has a deep atmosphere made up mainly of hydrogen, methane and other gases.

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22. Does Uranus have satellites?

Uranus has 21 known satellites. The exact sizes of these satellites are not known. The satellites of Uranus are: Cordelia, Bianca, Desdemona, Juliet, Rosalind, Belinda, Puck, Cressida, Miranda, Ariel, Titania, Umbriel, Oberon, Caliban, Stephano, Trinculo, Sycorax, Prospero, Setebos, Ophelia, and Portia. In 1977 Uranus's ring was discovered.

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23. How big is Neptune?

Neptune has a diameter of 50,000 kilometres, a little less than 4 times the diameter of the Earth. Its mass is 17 times of the Earth.

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24. How far is Neptune from the Sun?

The mean distance of Neptune from the Sun is 4,500,000,000 kilometres. The orbit of Neptune has a very small eccentricity.

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25. How fast does Neptune travel around the Sun?

Neptune revolves at 5.4 kilometres per second.

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26. How long are the day and the year on Neptune?

Like the other big planets, Neptune rotates at a high speed. Its day is about 15 hours. Neptune takes 165 of our years to make one revolution about the Sun.

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27. Does Neptune have atmosphere?

Yes. Neptune is very far from the Earth, but spectroscopic analysis of the light it reflects shows that its atmosphere is very much like that of other giant planets.

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28. Does Neptune have satellites?

Neptune has 11 satellites. One of them is one of the largest satellites in the solar system. This is Triton. It was discovered by Lassel in 1846. Triton's diameter is about 4,000 kilometres. The second satellite, Nereid, was found in 1949 by Gerard Kuiper. Its diameter is about 300 km. The motion of Triton is opposite to the direction of Neptune's rotation. Nereid is about 5,000,000 kilometres from Neptune. Nereid has a very eccentric orbit round Neptune.

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