Archives for the 'dark matter' Category
Dark antimatter?
Published on 26 Jan 2007 at 12:56 pm.
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Filed under dark matter, physics.
Every particle of matter had a corresponding particle of antimatter. When a particle of matter and a particle of antimatter come together they annihilate one another, creating two gamma rays traveling in opposite directions. So, when an electron and a positron (an anti-electron) meet, they produce two gamma rays having 511keV of energy. […]
AAS Meeting — Dark Matter
Published on 7 Jan 2007 at 11:40 pm.
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Filed under conference blogging, dark matter, physics.
Well, we are getting some interesting information here in Seattle. One thing that has apparently hit the news elsewhere is the new 3-D map of dark matter in the universe. Dark matter is invisible, so how do we map it?
Well, quite simply, we look for its gravitational effects. Dark matter, like all […]
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Dark Matter (part one)
Published on 18 Dec 2005 at 7:48 pm.
5 Comments.
Filed under cosmology, dark matter, physics.
A while back, Tom had suggested dark matter as a blog topic. So, here goes with part one. It is a pretty intense subject, and no one really understands all about dark matter, so it will be the subject of more than one entry.
The story goes back over 70 years. Fritz Zwicky […]
