Physicists believe most of the matter in the universe is made up of an invisible substance that we only know about by its indirect effects on the stars and galaxies we can see. But the nature of dark matter is a longstanding puzzle.
Research led by the Atacama Cosmology Telescope collaboration maps the universe’s cosmic growth supporting Einstein's theory of general relativity.
A few years ago, the first dark matter-free galaxies were announced, and then immediately disputed. Now, there are too many to ignore.
There are a lot of unsolved mysteries in the Universe, but dark energy is the most confusing. Here’s why.
The laws of physics work both forward and backward in time. So why does time seem to move in only one direction? One potential answer may also reveal the secrets of the universe’s missing mass.
If dark matter is the most abundant form of mass, and has gravity, where are all the dark matter structures?
What if the most popular hypothesis is wrong? Plenty of fringier theories exist.
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