[onedoug]

If dark matter couples to gravity, why aren’t there examples of it crashing into ordinary matter?

Dipstick theory.

[who_would_fardels_bear]

The scientists have accurately, or conveniently, given it properties such that:

1. It doesn't interact very well with normal matter, and

2. It's distributed around the outside of galaxies so as not to cause people to wonder why all of our orbital calculations remain correct even after the discovery of all that dark matter.

They are hoping to create dark matter at CERN. Also, there are people building dark matter detectors that I believe are similarly constructed to neutrino detectors; another bunch of particles that don't interact very much with other forms of matter.

[Gene Eric]

>> Dipstick theory.

Dark matter suggests time for oil change.

[onedoug]

I’m surprised cosmologists would just plug-in this type of data to get this hypothesis.

I suspect that the better part of matter in the universe is incorporated in black holes that we don’t know anything about, and as detection methods improve, I suspect strongly that dark matter will fall by the wayside.