- #1
Yoni
- 65
- 1
Can't it just be planets, asteroids, dust or gas which do not emit enough light to reach us?
mgb_phys said:MACHOS are massive compact halo objects, large bits of rock, black holes, dead stars that are too cool to detect.
I think they are pretty much ruled out as the source of all the dark matter, if there were enough of them we would see them as lensing effects as they pass in front of distant visible objects.
mgb_phys said:I imagine you just observe a large number of distant galaxies and look for short term variations in their brightness. From the rate of transient events you can work out the density of objects in the halo, although probably not anything about the halo object.
granpa said:so you use the rotation curve of the galaxy. that makes sense.
taylaron said:So let me get this straight Mathman, Dark Matter doesn't interact at all with any charged subatomic particles? What about Neutrinos?
-no wonder why none of our instruments will detect it.
I sure hope CERN turns something up.
taylaron said:What is the relationship between dark matter and dark energy? despite matter is a form of energy...
Dark matter is a form of matter that is thought to make up approximately 85% of the total matter in the universe. It does not emit, absorb, or reflect light, making it invisible to traditional forms of detection.
Dark matter is different from regular matter because it does not interact with electromagnetic radiation, making it invisible. It also does not emit or absorb light, making it difficult to detect using traditional methods.
The evidence for the existence of dark matter comes from observations of its gravitational effects on visible matter. This includes the rotation of galaxies, the bending of light, and the distribution of matter in the universe.
No, the exact composition of dark matter is still unknown. It is currently thought to be made up of one or more types of particles that have not yet been detected or fully understood by scientists.
There are several theories about the nature of dark matter, including the possibility that it is made up of weakly interacting massive particles (WIMPs) or axions. Other theories propose modifications to Einstein's theory of gravity to explain the observed gravitational effects of dark matter.