Mystic Sisterhood

Spiritual, Paranormal & Natural Science Forums



Next Chat Event

Astronomers find that dark matter dominates across cosmic time 5nvklj





Astronomers find that dark matter dominates across cosmic time 9tpt39

..


Astronomers find that dark matter dominates across cosmic time

Dragon
Dragon
Senior Administrator
Senior Administrator

Posts : 3512
Points : 15551
Times User Thanked: : 218
Join date : 2018-01-18

Astronomers find that dark matter dominates across cosmic time Empty Astronomers find that dark matter dominates across cosmic time

Post by Dragon on Fri Dec 14, 2018 11:41 pm

In findings published today in The Astrophysical Journal, University of Texas at Austin astronomers report that they have stumbled on an extraordinary galaxy that may corroborate a recently contested theory about dark matter.

Dark matter is matter that does not give off any light, but is detectable by its gravitational pull on other matter. It was first discovered in the 1970s in studies of spiral galaxies, whose outer regions rotated too fast only to be driven by the visible stars and gas in those regions. Astronomers reasoned there must be more mass that is unseen. Decades of galaxy observations have shown that almost all galaxies contain huge quantities of this "dark matter," and that, in fact, there is about five times as much dark matter as there is normal, visible matter in the universe.

However, a few recent studies have indicated that some galaxies don't follow the same pattern as the "dark matter-rich" galaxies found since the 1970s. These studies showed a handful of galaxies seen around 10 billion years ago do not contain the expected quantity of dark matter. This could mean that galaxies at that time didn't have much dark matter but gained it later, at some point in the past 10 billion years. If that's the case, it would challenge our fundamental understanding of how galaxies form.

Continued...
Source


_________________
Astronomers find that dark matter dominates across cosmic time 334pu7m
Dragon
Dragon
Senior Administrator
Senior Administrator

Posts : 3512
Points : 15551
Times User Thanked: : 218
Join date : 2018-01-18

Astronomers find that dark matter dominates across cosmic time Empty Re: Astronomers find that dark matter dominates across cosmic time

Post by Dragon on Fri Dec 14, 2018 11:43 pm

Astronomers find that dark matter dominates across cosmic time 14-astronomersf
Credit: Patrick Drew (UT Austin)/STScI/ALMA

This composite image of the dusty star-forming galaxy DSFG850.95 shows young stars, seen in blue from Hubble Space Telescope, and dust, seen in red by the Atacama Large Millimeter/submillimeter Array

Source / Image Courtesy


_________________
Astronomers find that dark matter dominates across cosmic time 334pu7m
Dragon
Dragon
Senior Administrator
Senior Administrator

Posts : 3512
Points : 15551
Times User Thanked: : 218
Join date : 2018-01-18

Astronomers find that dark matter dominates across cosmic time Empty Re: Astronomers find that dark matter dominates across cosmic time

Post by Dragon on Fri Dec 14, 2018 11:44 pm



Astronomers using NASA's Chandra X-ray Observatory have discovered the first pair of supermassive black holes in a spiral galaxy similar to the Milky Way.

Approximately 160 million light years from Earth, the pair is the nearest known such phenomenon. The black holes are located near the center of the spiral galaxy NGC 3393.

Separated by only 490 light years, the black holes are likely the remnant of a merger of two galaxies of unequal mass a billion or more years ago.


_________________
Astronomers find that dark matter dominates across cosmic time 334pu7m
Dragon
Dragon
Senior Administrator
Senior Administrator

Posts : 3512
Points : 15551
Times User Thanked: : 218
Join date : 2018-01-18

Astronomers find that dark matter dominates across cosmic time Empty Re: Astronomers find that dark matter dominates across cosmic time

Post by Dragon on Fri Dec 14, 2018 11:47 pm



NASA's Hubble Space Telescope reveals a majestic disk of stars and dust lanes in this view of the spiral galaxy NGC 2841, which lies 46 million light-years away in the constellation of Ursa Major (The Great Bear).


_________________
Astronomers find that dark matter dominates across cosmic time 334pu7m

Sponsored content

Astronomers find that dark matter dominates across cosmic time Empty Re: Astronomers find that dark matter dominates across cosmic time

Post by Sponsored content


    Current date/time is Wed Feb 26, 2020 1:57 pm