Crossposting allows news-reading software to "know" that the same article appears in both places, so (for example) if you (a human reader of both...

The event is called GW150914. This Nature page is a good summary http://www.nature.com/news/einstein-s-gravitational-waves-found-at-last-1.19361 as is this...

In a recent thread some posters argued that estimated masses for binary star systems do not get more accurate with time, so my choosing of 2012 as the start...

There is more and more evidence that there is something seriously wrong with our models of the early universe. Galaxies formed earlier than should be possible,...

One hopes Dan Hooper will turn down the hype now. http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.051102 http://arxiv.org/abs/1506.05104 --...

Those following the exciting developments relating to the apparent discovery of trillions of unbound, planetary-mass "nomads", and the growing interest in the...

Oumuamua is leaving us at high speed. Humans try to follow it with the VLT, and they report that the thing... is accelerating. Accelerating? When I first...

A recent _Nature_ article http://adsabs.harvard.edu/abs/2018Natur.555...67B shows evidence that the first stars appeared by z=20, about 180 Myr after the Big...

The 13th International LISA Symposium is happening online today (2020-Sept-01), tomorrow (2020-Sept-02), and thursday...

Obvious questions, regarding other threads he Does LCDM++ predict rotation of the DM regions or is DM movement almost rotation free? Would there be any...

Some may be interested in a Jul 9 online talk "Relieving the Hubble tension with primordial magnetic fields" by Levon Pogosian. Details are at...

A few years ago data from the Ia Supernova Cosmology Project found that Hubble's law is not linear but changes in a nonlinear fashion at large distances, ...

This is just a timely reminder the the terms "Dark Matter" and "Dark Energy" are confusing astronomers. I keep up with ArXiv and I find it amazing that so...

Is the NET angular momentum of a globular cluster of stars, zero? e.g. Omega Centauri or M13 for example. Is the NET angular momentum of an elliptical...

A BBC Horizon program described the correlation found between the galaxy hub black hole mass and the "sigma", the speed of the stars in the outer regions of...

Greetings, In the course of my architecture practice, I have encountered a client who wishes to built a personal observatory. Their budget for the scope...

On Mon, 15 Sep 14 20:17:26 GMT, Phillip Helbig wrote: writes: As a gedankenexperiment, let's look at two mathematical spheres, one ...

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...

Just posted to arXiv.org: http://arxiv.org/abs/1411.1518 Either a double-pulsar or a NS-WD binary. Strong candidate for Southworth's catalog. Angel is in...

aIs it possible that the missing mass, the 'dark matter', consists of two generations of burned out stars? These would be short lifetimes, hence large...