The firsts stars exploded 13.5 billion years ago, but because their light takes so long to reach us, we can still see what they looked like and even watch them explode.

If you attempted to count all the stars in a galaxy at a rate of one every second it would take around 3,000 years to count them all.

90% of the Universe is invisible. This mysterious missing stuff is known as 'dark matter'.

The elements Carbon, Hydrogen, Oxygen, and Nitrogen - all crucial to life - are found in roughly the same proportions in comets and human beings.

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