There's not enough space in the known universe to write out a googolplex on paper.
"Nucleus" is known as the focal point of a comet.
In 2006, Pluto was reclassified by the International Astronomical Union as a dwarf planet.
A year on Mercury takes 88 days for the Earth.
4.6 billion years old is the Solar System.
Martian Day lasts for 24 hours, 39 minutes, 35 seconds.
The Great Wall of China is not visible from space, but China's air pollution is.
Tortoises Orbited the Moon Before Astronauts Did: They Were Sent to Test a Russian Space Probe.
To our eyes, in space, the sun would appear white, not yellow.
Humans can live unprotected in space for about 30 seconds if they don't hold their breath.
Saturn's rings are not solid. They are made up of bits of ice, dust and rock.
The International Space Station is about the size of a football field.