] What do people think of the recent claim in Nature that one of the new wide field instruments has found a candidate diffuse galaxy NGC1052-DF2 which...

Amateur solar flare imaging is on my list of things to do. The problem becomes how to size and control a sun cover disk in the telescope. This is the...

There are 2 rocks in space. As a result of big bang the universe is expanding. Is it the vacuum that is expanding therefor the distance between the rocks or is...

"Just how big is the Andromeda galaxy?" (astronomy.com) http://astronomy.com/news/magazine/2018/02/adromeda-is-the-same-size-as-the-milky-way If the mass...

They meet in Mars exploration. Since quite a time, humans are roving the planet, "looking for life". Sadly, I think that this is not the case. Biology has...

] Gary Harnagel wrote: I'm having trouble picturing why we should see the CMBR at all. Since it's traveling at the speed of light but...

https://www.nature.com/articles/nature25180 https://arxiv.org/abs/1712.01860 -- jt]] Here we report observations of the quasar ULAS J134208.10+092838.61...

The most recent program of PBS Nova considered how massive black holes could have been formed in the early universe. It was concluded that they could not have...

Kepler uses dip in light curves of stars to determine the existence of exo-planets, but that presumption is that these "exo" solar systems have their...

On Monday, January 1, 2018 at 9:19:09 AM UTC-7, Phillip Helbig (undress to reply) wrote: In article...

] Interstellar object may hold 'alien' water The first known interstellar asteroid may hold water from another star system in its interior, according...

Imagine this: You are jogging and want to know your speed. Easy. Measure the CMB from all directions, and you will see that the CMB becomes bluer in the...

'Oumuamua has a rotation period of 8.1 hours, similar to Kuiper Belt objects implying a common origin in the vast depths of interstellar/intergalactic...

Okay, I've never heard anything about this before=E2=80=A6Somebody = please explain this: In scanning the wikipedia entry on "Escape Velocity",...

An impossible question? I would like to know if there is a straightforward way of calculating the sum of two different gravitational potentials U and V at...

If there is anew kind of attractive force, unknown to us, that pulls matter together, we should be able to see some effects of this feeble force in our...

As I read in the press, we have found a great percentage of dark matter. Astronomers have suceeded in seeing the shadows of filaments in the light of the CMB....

A smooth distribution corresponds to high entropy and a lumpy one to low entropy if gravity is not involved. For example, air in a room has high entropy,...

There have been many discussions here about WIMPs and searches for them. Today's CfA Colloquium given by Dan Hooper of Fermilab offered a good overview of the...

The article: https://www.newscientist.com/article/2149742-half-the-universes-missing-matter-has-just-been-finally-found/ claims that: "Half the universe's...