A see-through galaxy questions the need for dark matter

30 March, 2018, 00:43 | Author: Jacqueline Daniels
  • Astronomers baffled by distant galaxy that doesn't have any dark matter

Similarly, MOND theorists expect to find the most significant observable effects of their modified laws in less massive galaxies like NGC 1052-DF2, and lesser effects in more-massive galaxies.

In view of the proportion in different galaxies, a confined galaxy such as NGC1052-DF2 ought to have around a hundred times more dark matter than ordinary matter.

Astronomers researching the Hubble Space Telescope observations discovered a galaxy lacking dark matter, NASA said in a statement.

Utilizing a group of lenses called the Dragonfly Telephoto Array, a team led by Yale University's Pieter van Dokkum investigated NGC1052-DF2. "It is literally a see-through galaxy", he added. The newly discovered galaxy is about the volume and size of the Milky Way but has 200 times fewer stars.

Former Supreme Court Justice: 'Repeal the Second Amendment'
Heller , of which he was among the four dissenters, was wrong and ought to be overturned through a constitutional amendment . In a statement, Graham said he will continue to protect the right to bare arms, not repeal it from the U.S.

The team tracked the motions of 10 bright star clusters and found that they were travelling way below the velocities expected. "Dark matter has been rolled into galaxy formation and evolution theories for decades now, but this discovery of a galaxy that seems dark-matter-free puts a damper on many of those theories". Researchers were even more compared to a little bit stunned to discover a galaxy that has little to no dark issue at all. The team determined nearly all of the galaxy's mass could be attributed to stars, which means there is nearly no dark matter, the release said. The result is typically the spiral arms or gaseous discs you can see in other galaxies. "But what would you get if there were no dark matter at all?" The ones in NGC 1052-DF2 are mysterious in and of themselves: Many are comparable in brightness to Omega Centauri, the single brightest globular cluster in the Milky Way. It wasn't long after that they realized it was missing one of the things that, according to all prior research, makes galaxies tick: dark matter. Or, van Dokkum speculates, perhaps this ultra-diffuse, dark-matter-free galaxy arose from two streams of gas that collided and compressed to form a scattering of stars. When the team of scientists studied their behavior, it was revealed that the stars account of the most of the mass of the galaxy.

Each of these would certainly have to be analyzed in information to identify if it can develop the distinctive attributes of NGC1052- DF2.

Dark matter's existence is inferred from its gravitational influence on visible objects, which suggests it dominates over ordinary matter by a ratio of 5:1.

The galaxy is about 65 million light-years away in the constellation of Cetus and is about the same size as the Milky Way. The final option the authors suggest is that it formed as a large, nearby galaxy drew in a tremendous amount of gas, creating star-forming eddies.

Egyptian media say election turnout was around 40%
After counting the ballots, the results will be sent to the National Elections Authority which will announce the final results on April 2.

"It is conventionally believed to be an integral part of all galaxies, the glue that holds them together and the underlying scaffolding on which they are built", said co-author Allison Merritt from the Max Planck Institute for Astronomy, in Germany.

These ideas, however, still do not explain how this galaxy formed. They followed the motion of 10 star clusters to determine the mass of the galaxy. Three of them appear similar to NGC 1052-DF2.

For the study, the researchers used the NASA/European Space Agency's Hubble Space Telescope and several other observatories. Some physicists have postulated that there is no such thing as dark matter, however, and that what we perceive as giant, starlight-bending clumps of heavy, invisible material is actually something else that is profoundly misunderstood.

Huawei raises the bar with triple-camera phone and 40MP sensor
In the battery department, the phone draws its power from a non-removable user removable 4000 mAh Li-Po unit. The P40 Pro has a three camera setup with 40 megapixels (compared to the iPhone X and S9's 12MP).

Recommended:



Popular

Tim Cook says privacy is a human right and civil liberty
He said Facebook's inability to protect users' privacy had left lawmakers with no alternative but to impose legislation. Responding to challenges from his Twitter followers , Musk deleted the Facebook accounts of all his companies.

Rumour: Nissan, Renault to merge into single company
Nissan shareholders would also receive shares in the new company in exchange for their holdings, they said. Nissan shares had shed 0.5 percent to 1,094.50 yen in a market up 0.6 percent overall.

KU fans can watch Final Four game at Allen Fieldhouse
He has been lethal from the perimeter in that stretch, with 28 made 3-pointers on 54.9 percent shooting over seven games. I said no but you should pick a good team that you know and have seen play before and write up your own scouting report.

GoPro Unveils a $200 HERO, A Budget Action Cam for the Masses
GoPro today announced the release of yet another camera in its Hero range - one that's designed for the everyman. The GoPro Hero features a 10MP camera lens that can shoot HD video at 1440p and 1080p at 60 frames per second.

Malala returns to Pakistan for first time since assassination attempt
While her campaigning has taken her around the world, Yousafzai has also harbored a desire to return to her homeland. Abbasi told the Nobel laureate that Pakistan defeated militants after a hard war since her departure.

Iran's Revolutionary Guards Deny Giving Missiles to Houthis
He denied that his country has supplied missiles to the Yemeni Houthi militants who target Saudi Arabia's inner posts. Khoshrou called on the Muslin world and the global community to pressure Saudi Arabia to stop war in Yemen.

Nigerian government revises list of released Dapchi schoolgirls
But, a week later President Muhammadu Buhari apologised to the girls' families, saying: "This is a national disaster". He also insisted that no Boko Haram prisoner was swapped in exchange for the girls.

Isolated Showers Tonight & Wednesday
We can expect partly cloudy conditions to become mostly cloudy with showers and heavy down pours moving in by late Wednesday . A cold front will slide through early Wednesday evening bringing a small chance of a few brief light showers or sprinkles.

Scattered snow and rain showers today
This will allow our temperatures to get around 60F, which is much cooler than where we should be for this time of the year. Scattered showers will continue around western Montana this morning, then begin to move out by late morning and afternoon.

Germany friendly emotionally important for Brazil - Tite
Low's side sit top of the Federation Internationale de Football Association rankings and are now on a 22-match unbeaten streak. Toni Kroos and Germany meanwhile know they can not expect as easy a ride as they got in Belo Horizonte four years ago.