"It marks an exciting step forward in our understanding of dark matter and the dynamics of the Milky Way." A perplexing "break" in a stream of stars around the Milky Way could be the result of ...

Because we haven't found anything yet, we've started to wonder if dark matter might be lighter or heavier than we thought. Dark matter can't be too heavy or it might break our best model of the ...

Yet despite researchers’ best efforts over decades to work out the nature of this “dark matter” – to find some clue direct or indirect as to what it’s made of, or even make it in the lab ...

That’s how much of what’s floating about in the cosmos is ordinary matter—planets and stars and galaxies and the dust and gas between them. The other 95% is dark matter and dark energy ...