1
$\begingroup$

Are there any main stream theories of dark matter that would allow for it to form bodies which could participate in orbits with normal matter?

So, say, could a normal matter planet be captured and orbit around a "dark star"?

$\endgroup$
  • $\begingroup$ I think the answer is yes, given that dark matter interacts gravitationally. $\endgroup$ – João Vítor G. Lima Mar 8 at 15:05
  • $\begingroup$ I am worried that dark matter may not be capable of forming dense bodies $\endgroup$ – Paul Young Mar 8 at 15:06
  • 1
    $\begingroup$ Dark matter might not form dense bodies, but one can orbit a fuzzy halo of dark matter too. $\endgroup$ – Anders Sandberg Mar 8 at 15:26
  • 1
    $\begingroup$ I think "baryonic matter" is "normal matter". Unless dark matter is MACHOs, in which case it is a dense body of normal matter. $\endgroup$ – JEB Mar 8 at 16:50
  • 1
    $\begingroup$ "Dark" is the astronomer's term for something for which evidence exists, but which has not directly been observed. "Dark matter" is something massive that is presumed to be distributed throughout galaxies because the visible mass does not account for the way in which galaxies seem to evolve. Nobody knows what the dark matter consists of. Since nobody knows what it consists of, nobody can really say whether or not it could form dense, compact "bodies." $\endgroup$ – Solomon Slow Mar 8 at 16:56
2
$\begingroup$

In a sense, all stars, planets etc. in every galaxy are "captured" by dark matter because galaxies would not exist in their current form without dark matter to hold them together. However, there are good observational reasons to think that dark matter does not aggregate into anything more compact than a galaxy-sized halo - see https://en.wikipedia.org/wiki/Dark_matter#Dark_matter_aggregation_and_dense_dark_matter_objects.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.