Dark Matter (Anti-Matter)

[Spyman]

Water freezes, into a huge inter-stellar reservoir, of comets ("inter-stellar blizzard hail-storm") ??

What exactly is your claim and how is it related to the topic of this thread?

[Widdekind]

What exactly is your claim and how is it related to the topic of this thread?

 

Some amount of unseen matter might be in cold "comets". However, that would probably only add a planetary scale mass, per solar mass, of mass.

[Spyman]

Some amount of unseen matter might be in cold "comets". However, that would probably only add a planetary scale mass, per solar mass, of mass.

Yes and if so they would be included with other types of baryonic Dark Matter as Massive Compact Halo Objects. But there can't be enough unseen normal matter to account for all of the observed gravity, since that would cause much harder to explain problems with our understanding of Big Bang nucleosynthesis.

 

 

Massive astrophysical compact halo object, or MACHO, is a general name for any kind of astronomical body that might explain the apparent presence of dark matter in galaxy halos. A MACHO is a body composed of normal baryonic matter, which emits little or no radiation and drifts through interstellar space unassociated with any solar system. Since MACHOs would not emit any light of their own, they would be very hard to detect. MACHOs may sometimes be black holes or neutron stars as well as brown dwarfs or unassociated planets. White dwarfs and very faint red dwarfs have also been proposed as candidate MACHOs.

http://en.wikipedia.org/wiki/Massive_compact_halo_object

 

 

In astronomy and cosmology, baryonic dark matter is dark matter (matter that is undetectable by its emitted radiation, but whose presence can be inferred from gravitational effects on visible matter) composed of baryons, i.e. protons and neutrons and combinations of these, such as non-emitting ordinary atoms. Candidates for baryonic dark matter include non-luminous gas, Massive Astrophysical Compact Halo Objects (MACHOs: condensed objects such as black holes, neutron stars, white dwarfs, very faint stars, or non-luminous objects like planets), and brown dwarfs.

 

The total amount of baryonic dark matter can be inferred from Big Bang nucleosynthesis, and observations of the cosmic microwave background. Both indicate that the amount of baryonic dark matter is much smaller than the total amount of dark matter.

http://en.wikipedia.org/wiki/Baryonic_dark_matter

 

 

Theoretical considerations

Theoretical work simultaneously also showed that ancient MACHOs are not likely to account for the large amounts of dark matter now thought to be present in the universe. The Big Bang as it is currently understood simply couldn't produce enough baryons without causing major problems in the observed elemental abundances, including the abundance of deuterium. Furthermore, separate observations of baryon acoustic oscillations, both in the cosmic microwave background and large-scale structure of galaxies, set limits on the total baryon-to-total matter ratio. These observations show that a large fraction of non-baryonic matter is necessary regardless of the presence or absence of MACHOs.

http://en.wikipedia.org/wiki/Massive_compact_halo_object#Theoretical_considerations

Edited May 18, 2011 by Spyman