Darm Matter

[ck1]

Could other life forms and planets exist on our doorstep (earth's) that we can't see if they were constructed of dark matter?

[Old_Geezer]

:-) I think we need to establish what is is first. I suspect it won't be in large enough clumps to create anything like life/planets.

[Matheous-2]

ok1- I think thats a very good question.
Being open~minded, although not qualified, I can't think of a reason for there not to be since no one knows what dark matter is....

[jake-the-peg]

Well we've some strong indications of what dark matter is and it's not the sort of stuff that would make up things like life forms etc.

Antimatter is like that and there is a (slim) chance that some galaxies and stars and life forms are anti-matter.

But coming back to dark matter thetwo strongest candidates are Machos and Wimps

A Macho is a collective name for thinks like black holes, neutron stars etc anything that doesn't emit light

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

I don't think many people still think that Machos are enough to explain the effects of dark matter that we see

Wimps are Weakly interacting massive particles.

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

these are subatomic particles that interact so slightly we only see their gravitaional effect.

Take neutrinos - once we thought they were massless - we now know that they do in fact have mass but it's so slight we can't measure it

But there's a lot of them - every photon is associated with an anti-neutrino and that adds up!

[TWR]

They are already here CK1, they call them MPs in reality, they are from another planet.

[jim360]

Surely every electron is associated with an antineutrino rather than a photon?

Anyway there are unlikely to be dark matter lifeforms around as presumably they would need to feed and would need to take up space and we would detect them through the apparently empty gaps in the earth's surface. So no, probably not.