The dark side of the universe
Most of the cosmos is invisible, but that doesn’t stop scientists from searching for it
By Stephen Ornes, 17:06 PM April 26, 2011
If seeing is believing, then we shouldn’t believe in most of our universe.
We can see the sun, other stars and faraway objects that glow in the dark. With the right tools, we can even see things that would otherwise be invisible, like the air in the atmosphere or hot gas in distant galaxies.
Astronomer Carl Sagan liked to say, “We are made of star stuff.” He meant that everything we know — you and your dog, the Earth and moon — is made of the same kinds of atoms as glittering stars. These ...
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