Neutron stars can lose a lot of energy by emitting neutrinos. This is supposed to be the way recent formed neutron stars cool quickly.
The small surface area compared to the huge mass makes blackbody radiation not very efficient and only seems to become the dominant way of cooling after...
It is not constant. At some WMAP conference in 2013 it was estimated that the CMBR map will look totally different in about 1 billion years.
Very small changes might be detectable on the order of 100 years.
Link to blogpost about that conference.
It includes an animation of how those changes...
No, it is extremely unlikely this would be noticable inside the solar system.
There is a decent chance our solar system would be moved. There is a extremely small chance of destruction by the supermassive black holes then. If the Sun gets moved, it is most likely it will get moved much further...
I think it was based on an article in Nature:
A density cusp of quiescent X-ray binaries in the central parsec of the Galaxy
https://www.nature.com/articles/nature25029
If I understand correct general relativity predicts a point of infinite density at the center of a black hole and this result can't be what is really going on. Questions: is this correct? Also why wouldn't the the mass inside a black hole keep contracting, only reaching infinity after an...
Hello Kimbyd,
I do not understand what the linked article has to do with SMBH made from PBH. The article concludes that there are not enough pbh's to make up for dark matter. I did not see anywhere that there was no possibility PBHs or that these could not have been the seeds for SMBH's. Could...
Thanks for answering.
Yes I ment Mpc where I wrote mpc :oops:.
So for a more realistic example I would have to use Gpc? At that scale I cannot simply use 70 km s−1Mpc−1 anymore because this varies over time? Or did I make more wrong assumptions?
So if space would expand with 70kms/mpc and we would be able to observe an event 10mpc away, would two photons coming from the event separated at the event by 1 second arrive with a time separation of 1 + (10*70/c) on our location?
Asking this to see if I understand some of this expansion. I...