http://arxiv.org/abs/1603.00464 Title: Did LIGO detect dark matter? AUs: Bird et al Possible evidence for primordial black holes as dark matter. RLO ;)...

So I have a basic question on dark matter. As I understand it, it does not interact with normal matter except by gravity, and according to observation of the...

Example object, Pictor A http://chandra.harvard.edu/photo/2016/pictora/ in particular, the x ray Chandra...

Several years ago, I wrote some Fortran code which calculates the angular-size distance (from which all other distances, except the "distance" related to...

Source: http://arxiv.org/abs/1210.5302 Authors: N. Cappelluti, A. Kashlinsky, R. G. Arendt, A. Comastri, G. G. Fazio, A. Finoguenov, G. Hasinger, J. C....

As I mentioned in another thread, the disk of the satellite galaxies of Andromeda is extremely thin: http://arxiv.org/abs/1301.0446 A Vast Thin Plane of...

Title: A new look at microlensing limits on dark matter in the Galactic halo Author: M.R.S. Hawkins Journal: Astronomy and Astrophysics, vol. 575, pg. 107,...

For the black hole information paradox I would expect two seemingly conflicting results (as is necessary for a paradox by definition,) e.g. like: 1) We know...

What are the functional relationships dictating galactic size (presently ~10^22 cm) and star planetary system size (presently ~10^15 cm) contained in a Hubble...

Regarding the publication in Nature of evidence for a huge population of unbound planetary-mass objects in our galaxy, the following comments are offered. A...

Can anyone reference the paper or even just a report stating the redshifts of these...

Phillip Helbig wrote: "Dark energy" is a newfangled name for the cosmological constant. As Sean Carroll points out, a better name would be "smooth tension". ...

Hello, I am looking for online images of galactic rotation curves that shows curves as a function of distance from the galactic axis, and if posible, also as...

Several previous posts indicate that readers of s.a.r. include a fair number of IRAF users. I have become aware that an internal NOAO memo is suggesting that...

I have suggested on my web page http://www.plasmaphysics.org.uk/research/redshift.htm that the Hubble redshift of galaxies is due to the 'stretching' of the...

A recent paper, astro-ph/0907.3432 by Milan Cirkovic, reviews the arguments surrounding Fermi's Paradox. There is a good discussion of how quickly the galaxy...

In article , robert bristow-johnson wrote: i thought (my amateur understanding) the other...

Is there any rational explanation as to how matter came to be in the first place? I seem to remember reading that matter can be created from nothing more than...

This post continues other data points in this discussion group. http://www.space.com/scienceastronomy/060608_galaxy_cluster.html "Located nearly 10 billion...

The probability of a hypothetical event (the Big Bang) can never be greater than the probability of the most likely theory that supports the existence of...