A question about typical galactic superclusters, like Horologium, Shapley, or Hydra-Centaurus: Disregarding their Dark Matter components entirely, and looking...

Work by Canup et al, among others, implicates Lagrangian points in the Giant Impact Hypothesis for the formation of the moon from a Mars sized impactor which...

Catching up on some of my reading, I see an impressive observational paper: Matthew D. Lehnert et al Title: Spectroscopic confirmation of a galaxy at redshift...

In discussions about space "expansion" I hear always that connected (or "bound" objects) are NOT affected by this space expansion. OK. But what is...

http://www.nasa.gov/mission_pages/GLAST/news/new-structure.html Regarding the physics of the phenomenon, it looks like what one might expect for bipolar...

Has anybody else noticed a resemblance between the asteroid Itokawa and today's EPOXY photos of Comet Hartley 2? Both objects are of similar size and show...

Can anyone direct me to a 'phase diagram' showing different classes of stars, e.g. normal stars, white dwarfs, neutron stars, black holes etc. I know such a...

A Java program to convert JPL DE2xx and DE4xx ephemerides from ASCII to binary FITS tables is available in...

] The discussion of ?The Grand Design? by Hawking and Mlodinow at various venues gives one the impression that the distinctions between non-scientific...

As both moderators of s.a.r. are travelling for parts of August, it is possible that there will be some delay in posting new articles, particularly in the...

Is there a very general equation(s?) for calculating the gravitational potential experienced by each member of a pair of roughly equal masses (stars or...

Hi, I would like to discuss a hypothesis that the spectroscopically undetectable dark matter is actually Big Bang nucleosynthetic adiabatically...

hi, i was sorta referred to here from sci.physics.research... assuming you have a broadband radio telescope in space or on the moon, and you are pointing it...

Mainly based on the results of the Huygens probe and the radar sensing by Cassini, an image of the physical world of Titan has been developed. Often analogies...

NY Times reported they had a big announcement for today (Tuesday). What happened? Did they want to wait till after Obama's speech or did the Times just get it...

The MILLIQUAS (Million Quasars) catalogue v2.0 is now available, it presents all quasars/AGN/Bl Lacs published / accepted to 12 June 2010, including...

Just when you thought your cosmological assumptions were rock...

On Fri, 11 Jun 10, "Robert L. Oldershaw" wrote: An international team of astrophysicists has identified "five new possibly irreconcilable problems" for the...

Hello Group! Unquestionably the most interesting reference covered by ACG monthly notes for May 2010, (link;...

My thanks to various posters who have given me a figure for the density of CDM. You have now really convinced me that the theory of CDM must in all likelyhood...