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
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.
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