Hello, There seem to be some growing concerns about black holes. Btw, 1. Whether earth & our solar system is moving fast towards any black hole? If so,what...

The NGC Ten Minute Challenge NGC 891 (Caldwell 23) in Andromeda NGC 891 (or Caldwell 23) is a edge-on spiral galaxy with a distinct dust lane. It was...

This is really more an optics question, but I'm hoping someone here can answer this question from an astronomy course and explain the reasoning. Thanks! A...

The Messier Ten Minute Challenge M109 - Galaxy in Ursa Major M109 is a typical barred spiral galaxy. Rather surprisingly many visual observers are unable to...

The Messier Ten Minute Challenge M108 - Galaxy in Ursa Major Seen from a distance of 36 million light years M108 is a very small spiral galaxy - 5% of the...

I can't help but think that this is a trick question on a quiz. If you see the moon rise at 9 in the evening then it should be a waxing gibbous (heading...

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Hi everyone: I'm new to this group, and looking for assistance. I've been struggling to get to grips with 3D spherical geometry, and I could use some good...

The Messier Ten Minute Challenge M106 - A Spiral Galaxy in Canes Venatici M106 or NGC 4258 is a Sb type spiral galaxy seen from a distance of about 25...

Urban astro-nerds, rejoice! The smog and lights of the city will obscure your view of the heavens no more. And your star photography will twinkle. Now you can...

The Messier Ten Minute Challenge M104 - Sombrero Galaxy in Virgo M104, with a diameter of 100,000 light years and a mass of 1.3 trillion suns is one of the...

We've all seen the human-like face on Mars, and the little figure striding out across the red soil. Here at last is a similar indication that, despite the...

This from another astro group I read... Come on folks, sign up and don't let the Government loose us another important resource ! Spread this about too, the...

A Revised Classification of the Variable Star NSV 620 01 44 38.00 -77 22 12.0 (Hydrus) The period of 47.2 days taken together with the scatter in the...

The Messier Ten Minute Challenge M101 - Galaxy in Ursa Major The spiral galaxy M101 is a beautiful, large, face-on spiral galaxy. Several knots of emission...

Maybe some kind soul can answer this for me and tell me what I'm missing ? If the universe is just under 14 billion years old how can it be (from what I've...

The Messier Ten Minute Challenge M100 - Galaxy in Coma Berenices M100 is a spiral galaxy, like our Milky Way, and tilted nearly face-on as seen from earth....

The Messier Ten Minute Challenge M99 - Galaxy in Coma Berenices Messier 99 (NGC 4254) is a beautiful spiral galaxy seen almost face- on. It rotates clockwise...

hi I want to know some information about "BLACK WHOLE" can u help me?

The Messier Ten Minute Challenge M98 - Galaxy in Coma Berenices Messier 98 (NGC 4192) is one of the faintest objects in Messier's catalog. It is a beautiful...