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Royal Astronomical Society’s National Astronomy Meeting 2015 – report 3
via astronomynow

The Venue Cymru conference centre on Llandudno seafront, home of the Royal Astronomical Society’s National Astronomy Meeting 2015. Image credit: Venue Cymru Science writer and editor Kulvinder Singh Chadha presents his third report from the Royal Astronomical...
Known Dark Matter Isn’t Enough
via briankoberlein

Last time we saw that while alternative gravity models don’t agree with galactic stellar motion and gravitational lensing, the dark matter model does. While some of that dark matter is likely regular (baryonic) matter such as MACHOs (brown dwarfs, neutron...
Nasa reveals huge 'coronal hole' on the solar surface where winds reach 500 miles per SECOND
via nesaranews.blogspot

Mystery at the sun's south pole: Nasa reveals huge 'coronal hole' on the solar surface where winds reach 500 miles per SECOND Coronal holes are regions of the corona where the magnetic field reaches out into space Particles moving along those magnetic...
Black Holes Might Make Dark Matter Shine
via mannaismayaadventure

Post 6844 Black Holes Might Make Dark Matter Shine by Calla Cofield, Space.com Staff Writer | May 14, 2015 07:00am ET An artist’s concept shows a black hole eating material from a nearby star. Researchers say its possible dark matter swirling...
From Black Holes to Dark Matter, an Astrophysicist Explains - In Tech and Science
via apnironaq

This artist’s impression shows the surroundings of a supermassive black hole, typical of that found at the heart of many galaxies. The black hole itself is surrounded by a brilliant accretion disc of very hot, infalling material and, further out, a dusty...

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Is the North star going to stay in the North sky?

Considering how the our solar system, and how every other star in the galaxy is traveling through the cosmos, it seems like it's a miracle that the stars and constellations in the sky stay as constant as they are. How is it that the North Star seems...
Were magnetic monopoles created before, during or after inflation?

In the case that magnetic monopoles exist, when were they created? I thought that all particles were created after inflation, but I've read some comments recently that hint at a pre-inflationary creation of magnetic monopoles.
How are errors on X-ray photon index propagated to X-ray spectral index?

I have seen that in X-ray astronomy, astronomers often talk in terms of photon index $\Gamma$, which is related to spectral index $\alpha$ by relation $\Gamma$ = $\alpha$ + 1. Are the errors on $\alpha$ same as the errors on $\Gamma$? Someone told me...
X-ray flare questions

I search the reference papers about flare, but nobody said something about below clearly. Could anyone give some help? If a single X-ray decay without eclipse or other irrelevant factors is not able to fitted well by an exponential decay, can we say...
Can asteroids contain atmosphere?

Gas is abundance in the universe, can a massive asteroid draws in these gas forming a thin atmosphere?

Astronomy.stackexchange.com popular pages

Astronomy Stack Exchange

Q&A for astronomers and astrophysicists
the sun - Can our Sun become a black hole - Astronomy Stack Exchange

Does every star become a black hole? Is there any probability that our sun can become a black hole? If yes then is it on its way to become a black hole? what is the current state of sun as per the ...

Should I focus more on Aperture or Focal Length for a telescope? - Astronomy Stack Exchange

Let's assume there are three types of telescopes with the following specifications: Telescope Aperture Focal Length ------------------------------------------...