Home » News & Blogs » Only Dark Matter (And Not Modified Gravity) Can Explain The Universe
Bookmark and Share
Starts With a Bang!

Only Dark Matter (And Not Modified Gravity) Can Explain The Universe

13 Mar 2018, 16:45 UTC
Only Dark Matter (And Not Modified Gravity) Can Explain The Universe
(200 words excerpt, click title or image to see full post)

The evolution of large-scale structure in the Universe, from an early, uniform state to the clustered Universe we know today. The type and abundance of dark matter would deliver a vastly different Universe if we altered what our Universe possesses. (Angulo et al. 2008, via Durham University)There have been a lot of public advocates from the “no dark matter” camp, getting lots of popular attention. But the Universe still needs dark matter. Here’s why.If you took a look at all the galaxies in the Universe, measured where all the matter you could detect was, and then mapped out how these galaxies were moving, you’d find yourself quite puzzled. Whereas in the Solar System, the planets orbit the Sun with decreasing speed the farther away from the center you go — just as the law of gravitation predicts — the stars around the galactic center do no such thing. Even though the mass is concentrated towards the central bulge and in a plane-like disk, the stars in the outer regions of a galaxy whip around it at the same speeds as they do in the inner regions, defying predictions. Obviously, something is missing. Two solutions spring to mind: either there’s some ...

Latest Vodcast

Latest Podcast

Advertise PTTU

NASA Picture of the Day

Astronomy Picture of the Day

astronomy_pod