Dark matter could be made of particles that each weigh almost as much as a human cell and are nearly dense enough to become miniature black holes, new research suggests. PLAY VIDEO How Do We Know Dark Matter Is Out There? We hear a lot about dark matter, and how physicists are ever on the hunt for it. But how do you look for something you can't even see? While dark matter is thought to make up five-sixths of all matter in the universe, scientists don't know what this strange stuff is made of. True to its name, dark matter is invisible — it does not emit, reflect or even block light. As a result, dark matter can currently be studied only through its gravitational effects on normal matter. The nature of dark matter is currently one of the greatest mysteries in science. If dark matter is made of such superheavy particles, astronomers could detect e...
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