Facts About Space

Space exploration - the Apollo 12 Lunar Module in lunar orbit

Above: The Apollo 12 Lunar Module in lunar orbit, photographed 19 November 1969 from the Command and Service Modules (Credit: NASA).

10 Facts About Space

99.8% - the amount of the solar system's total mass that is contained within the sun alone.

More facts about the Sun

88 days - the length of a year on Mercury, the fastest orbiting of all the planets.

More facts about Mercury

118 days - the length of time between one sunrise on Venus and the next.

More facts about Venus

5,500°C - the average temperature of Earth's core, as hot as the surface of the sun.

More facts about Earth

14 miles - the height of the martian volcano Olympus Mons, the tallest mountain in the solar system, around 3 times taller than Mount Everest.

More facts about Mars

5,268 km - the diameter of Jupiter's largest moon, Ganymede, bigger even than the planet Mercury.

More facts about Jupiter

270,000 km - the diameter of the outer rings of Saturn, the largest in the solar system.

More facts about Saturn

-224°C - the temperature to which Uranus can plunge, making it the coldest planet in our solar system even though Neptune is further from the sun.

More facts about Uranus

1,300 mph - the approximate speed that winds can reach on Neptune, the fastest in our solar system and faster than the speed of sound.

More facts about Neptune

200 million - the estimated number of objects in the asteroid belt with a diameter greater than 1 km.

More facts about Asteroids


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About The Site

There is a great deal of in-depth coverage on space, the solar system and our planets online, most of it excellent, some of it fanciful. Facts About Space is a site designed to provide a quick and simple reference to some of the more significant and interesting facts and figures on space and our place within it. We hope you find something of value here.

If you reference the material from this site on another website or in any published material please credit FactsAboutSpace.net.

Important Note

All of the facts and figures displayed on Facts About Space are correct to the best of our knowledge. However, the accuracy of the information presented cannot be guaranteed, and so in using any of the facts or images from this website you do so entirely at your own discretion.

If you spot an entry that you believe requires correction do please let us know - we do not wish to perpetuate inaccuracies. You can contact us at 'hello /at/ history in numbers /dot/ com'.