We actually DO have empirical evidence for the existence of dark matter.
Yeah, it's right next to the invisible pink unicorn exhibit in Meinong's Jungle.
"It's not that most of the matter and energy in the universe is dark, but that most cosmologists are totally in the dark about the real nature of the universe." -- Wallace Thornhill, physicist, October 2006
Could you please send me some Dark Matter so that I might observe it and experiment on this mythological substance?
and you have the mass of the universe.
LOL.
You have a scale big enough to measure the mass of the universe?
Let's use some logic here: not even an angel could determine with mathematical rigor what the mass of the universe is.
some of the mass must not be emitting light/radiation. Planets certainly don't.
If planets don't emit light or radiation how do you know what color they are?
But I'm pretty sure black holes answer this question.
Black holes are imaginary. They do not exist in physical reality.
"Even mainstream scientists admit that at singularities the ‘laws of physics’ break down. It would be more accurate to say that their own theories break down." -- David Pratt, natural philosopher, 2005
"A study published in 1995, based on Hubble Space Telescope observations of 15 quasars, showed that 11 of them had no surrounding material that could fall into any hypothesized black holes, yet they were somehow producing intense radio emissions." -- Aard Bol, physicist, 2004
"I have little faith in the usual treatment of the black hole problem." -- Fred Hoyle, cosmologist, 1972
"...the 'Schwarzschild singularities' do not exist in physical reality." -- Albert Einstein, mathematician, 1939
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They don't emit radiation and they're really massive.
Alleged black holes emit radiation called "Hawking Radiation" and they also spew out galaxies.
http://www.sciencedaily.com/releases/2009/11/091130112413.htm
black holes may be "building" their own host galaxy.