Missing Mass
Unobserved mass in clusters of galaxies believed to provide sufficient gravity to bind the cluster together.
Model ...
Missing Mass Problem
Poses the question: why does the Universe seem to have much more mass in it than can be seen with a telescope?
Missing mass- several seperate experiments show that there is more matter in the universe than we can see; more than that, this so-called "dark matter" accounts for about 25% of the universe's total mass-energy, ...
Missing Mass
Kormendy, J. and Knapp, G. R. (Eds.). Dark Matter in the Universe: Proceedings of the 117th Symposium of the International Astronomical Union held in Princeton, New Jersey, USA, June 24-28, 1985. Dordrecht, Netherlands: Reidel, 1987.
[7.5] MISSING MASS & GALACTIC DARK MATTER
[8.0] Beyond The Milky Way
[8.1] THE REALM OF THE GALAXIES ...
Could the missing mass be around as energy from the Big Bang?
Could neutrinos be the missing Dark Matter?
How are WIMPS distributed in a galaxy?
Might not this missing mass puzzle signal instead the break-down of the newtonian limit of gravitational theory for very large systems? In this connection several schemes alternative to Newtonian theory have been proposed.
missing mass (astrophysics) (NASA Thesaurus) A problem related to a cluster of galaxies in which the mass derived from the dynamical stability of its member galaxies, the dynamical mass, ...
Determining the nature of this missing mass is one of the most important problems in modern cosmology and particle physics. Its urgency is underlined by David B. Cline in a 2003 article in Scientific American, in which he writes: "The terms . . .
By that time, the missing mass problem of big bang nucleosynthesis and large scale structure was established, and some cosmologists had started to theorize that there was an additional component to our universe.
Much of this invisible dark matter, which astronomers call "missing mass", could be made up of brown-dwarfs. Our universe is currently expanding, due to the Big Bang.
Clearly, most of the mass is in a more extended distribution than stars or gas - the "missing mass" (even though what is missing is in our brains, not in the mass).
We have discussed this possibility previously when we talked about the ``missing mass'' or dark matter implied by galaxy rotation curves.
"When Fritz Zwicky first detected the missing mass problem in the 1930s the ratio between the matter that he could see and that which he couldn't but was needed to keep a galaxy cluster stable was about 600.
Dark matter was postulated by Fritz Zwicky in 1934 to account for evidence of "missing mass" in the orbital velocities of galaxies in clusters.
A helium nucleus is only 99.3% as heavy as four protons. The missing mass is converted into energy. It is this energy which causes the star to shine and stops it from collapsing due to the pull of gravity.
A helium atom has less mass than the hydrogen energy from which it was created and this missing mass turns into energy. Few other methods can generate as much energy as nuclear fusion.
Morris, Cosmic Questions: Galactic Halos, Cold Dark Matter and the End of Time (1995); T. Van Flandern, Dark Matter, Missing Planets, and New Comets (2d ed. 1998); M. Hawkins, Hunting Down the Universe: The Missing Mass, ...
extremely low luminosities, brown dwarfs are are one of the candidates for baryonic dark matter. However, currently observations suggest that there are insufficient numbers of brown dwarfs to account for a significant fraction of the missing mass of ...
but this gas does not solve one of the great puzzles in astronomy which is that these clusters require a certain total mass to explain how they are held together but we only can account for one tenth of this mass. This is known as the `missing mass ...
Sun, hydrogen atoms are squeezed together, or fused, into helium atoms -- roughly akin to crunching a few baseballs together and getting a football. A helium atom has less mass than the hydrogen atoms from which it was created, and this missing mass ...
It was long speculated that neutrinos might make up a large fraction of the 'missing mass' of the universe, but upper energy/mass boundary is too low to allow them to make up more than a tiny fraction of the total mass of the universe.
If in fact neutrinos have no mass there might be other particles, as yet undetected, that could fulfill the same role. Thus particle physicists have some interest in what the astronomers learn about this dark "missing mass." ...
 See also: Mass, Universe, Energy, Light, Galaxies
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