It is a red dwarf star which has a surface temperature of 5,030 ° F (2,777 ° C), which is twice as hot as the temperature required to melt steel. Gliese 22 is a whopping 22 light years away from our planet.
The Milky Way weighs a solar mass of around 1.5 trillion.
Diamonds rain on Saturn and on Jupiter.
NASA has found water as ice on the moon.
The moon is the only other planet on which people have set foot. Since the moon has no atmosphere or wind, the footprints that the Apollo astronauts planted on its dusty surface in 1969 are still there today, perfectly preserved.
The gravity of the moon is 17 percent of that of the earth, meaning astronauts can leap 4 m high on the moon in space suits.
They look redder as light waves from distant galaxies are spread out of their way. This is called a change in red.
The most distant galaxies (quasars) have red shifts so large that at speeds reaching the speed of light, they must be moving away from us.
84 trillion joules of energy was emitted by the Hiroshima bombs. 125,000 trillion times were produced by a supernova as such.
Every minute, the nuclear fusion reactions at the center of the Sun send out billions of light photons, but it takes 10 million years to reach its surface.