Supernova from space (thanks to NASA and the Hubble Telescope) What is a supernova? Supernovas are exploding stars. Red giant stars explode when they have used up their hydrogen and helium fuel, and converted most of their atoms to iron [...]
The Eagle Nebula Stars don't last forever, though they do last for billions of years. And they don't stay the same throughout their existence - they change over time. The [...]
What are planets? The planet Venus from space Before there were planets For several hundred million years after the Big Bang, there were no planets, only stars. Planets couldn't form until the [...]
The Eagle Nebula A nebula is a bunch of atoms and molecules floating in outer space, like a cloud of dust. More than one nebula are called nebulae, because -ae is the plural ending [...]
The galaxy M 100, seen through the Hubble telescope What is a galaxy? A galaxy is a group of millions of stars that are relatively near each other. Most stars seem to [...]
Earth from space: How old is the Earth? When did the Earth form? Like Mercury and Venus and the other planets that go around the Sun, the Earth probably formed a little more than four and a [...]
A comet in the night sky What are comets made of? Comets are balls of leftover rock and ice in space. They started out when a star exploded into a supernova. What is a supernova? More about [...]
