A lot of normal matter in the Universe is missing. Astronomers think they might have found it, and it's been hiding in plain sight all along.
If you're a space and astronomy fan, chances are you're already clued-up on dark matter.
This strange, invisible stuff cannot be observed directly, but it makes up more than a quarter of all the mat… [+5814 chars]
This strange, invisible stuff cannot be observed directly, but it makes up more than a quarter of all the mat… [+5814 chars]