[RD]

It just occurred to me that planets with rings must have ringshine , (cf. moonshine) ...



"Saturn by Ringshine" ... https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA10476

[Available in large "wallpaper" sizes]

[sophiewilson0191]

Truth to be told by a great mind Stephen Hawking.
Rest in Peace.

[Jaaanosik]

Could this halo be the missing 'dark matter' that explains galaxy rotation issue?
https://en.wikipedia.org/wiki/Galaxy_rotation_curve

The image is from here: https://www.nasa.gov/feature/goddard/nasa-s-hubble-finds-giant-halo-around-the-andromeda-galaxy

[Janus]

Could this halo be the missing 'dark matter' that explains galaxy rotation issue?
https://en.wikipedia.org/wiki/Galaxy_rotation_curve

The image is from here: https://www.nasa.gov/feature/goddard/nasa-s-hubble-finds-giant-halo-around-the-andromeda-galaxy

The article states that the estimated mass of this halo is 1/2 the total mass of the stars in Andromeda.  To account for the galaxy rotation curves, it would need to be a few times the total mass of the stars.

When it comes to effecting the orbital speed of a star in a galaxy it is only the mass that is closer to the center of the galaxy than the star that counts (imagine the star as being on the surface of a bubble. it is the mass inside that bubble that determines its orbital speed.)   For the gas halo to provide the required mass, it would have to be many times the density it is measured to have.  Also, as the article points out, this gas plays a role in star formation for the galaxy.  If it was many times denser, it would have had a profound effect on this.

[rsneha]

Cool pics

[TimothyKiz]

Uh, no.  If the universe is 14 billion years old, there is no reason to believe that advanced life could form and find us by now.   I think there is likely life out there, based on the mathematics ,  but finding us is almost impossible.

[RidaChat]

WOW! amazing!!!
These what we called wonders and mysteries.
I don't have any photo to share at the moment. But I loved staring stars in a clear night sky.

[Balticskillz]

The galaxy is a big and mysterious place. Astronomers are consistently finding new planets.  We had a very heated forum discussion if unidentified planets and if life truly exists on other planets. Find out more! My opinion we are not alone!

[ashking]

anyone wants to share any pic can do here

[Paul25]

Mindblowing pics

[adamsmitt]

Cool, it is so amazing. Thanks for sharing it.

[AsfandBoss1122]

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[Kryptid]

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