Mercury

The diameter of Planet Mercury is 4,878 km;

The orbital speed of Mercury is 47.8 km/second;

Mercury has no atmosphere and no known satellites, perhaps because of its proximity to the Sun.

Venus

The diameter of Venus is 12,100 km (7,522 miles);

The orbital speed of Venus is 35 km/second;

The atmosphere of Venus is primarily composed of carbon dioxide (96%) and nitrogen (3%), with traces of other gases and little to no water vapour.

Earth

The diameter of the Earth is 12,756 km (7,926 miles);

The earths orbital speed is 29.8 km/second;

The Earths atmosphere is composed mainly of nitrogen (78%), oxygen (21%), argon (.93%), and carbon dioxide (0.03%).

Mars

The diameter of the planet Mars is 6,785 km;

The orbital speed of Mars is 24.2 km/second;

The atmosphere on Mars is very thin, composed mainly of carbon dioxide (95%), nitrogen (2.7%), and argon (1.6%), with traces of oxygen and water.

Jupiter

Jupiters diameter is 142,984 km;

The orbital speed of Jupiter is 13.1 km/second;

Jupiter has a small rocky core surrounded mostly by hydrogen and helium.

Saturn

The diameter of Saturn is 119,871 km (74,500 miles);

The orbital speed of Neptune is 9.7 km/second;

Saturn has a small rocky core surrounded mostly by hydrogen and helium.

Planetary data cards

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Uranus

The diameter of Uranus is 51,488 km (32,000 miles);

The orbital speed of Uranus is 6.6 km/second;

The atmosphere of Uranus is composed of hydrogen, helium, and methane. The methane in the atmosphere absorbs red light, giving the planet a blue-green colour.

Neptune

The diameter of Neptune is 49,493 km;

The orbital speed of Neptune is 5.4 km/second;

Neptune is a gaseous planet, composed of hydrogen, helium, methane, with traces of ammonia and water.

Picture: NASA Picture: NASA

Picture: NASA Picture: NASA Picture: NASA

Picture: NASA Picture: NASA Picture: NASA