"Because in Cyberspace, no one can hear you scream."
Wednesday, February 23, 2005
Photo from Space.com
Astronomers have discovered an invisible galaxy that could be the first of many that will help unravel one of the universe's greatest mysteries.
The object appears to be made mostly of "dark matter," material of an unknown nature that can't be seen.
I'm not going to even try to explain this one.
Theorists have long said most of the universe is made of dark matter. Its presence is required to explain the extra gravitational force that is observed to hold regular galaxies together and that also binds large clusters of galaxies.
Theorists also believe knots of dark matter were integral to the formation of the first stars and galaxies. In the early universe, dark matter condensed like water droplets on a spider web, the thinking goes. Regular matter -- mostly hydrogen gas -- was gravitationally attracted to a dark matter knot, and when the density became great enough, a star would form, marking the birth of a galaxy.
I've heard about this stuff before--and to tell you the truth it perplexes me to this day. With 25% of the universe made out of this dark stuff (with 70% made up out of dark energy), it comes to no surprise that a galaxy was found made entirely out of it. Selah!
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