Milky Way Galaxy Totals About 1.5 Trillion Solar Masses, New Study Concluded
11 Mars, 2019, 10:48 | Auteur: Therese Cote
Researchers used data from the Hubble telescope and Gaia satellite, which is recording the positions of stars to create a three-dimensional map of the Milky Way, to measure the movement of these clusters.
"For some context, the lowest mass galaxies are around a billion solar masses and the most massive are around 30 trillion solar masses, so the Milky Way is on the higher end of this range-but we already knew that", said Watkins.
In conclusion, the Milky Way galaxy weighs the equivalent of about 1.5 trillion solar masses, by about three times more than the previous estimation said.
From stars, planets, and asteroids through to black holes and invisible dark matter, our galaxy is packed with a lot of stuff. One of the interesting factoids that NASA has offered up about its mass estimate is that only a tiny percentage of the Milky Way's mass is attributed to the approximately 200 billion stars in the galaxy. Previous estimates believed that the mass is as low as 500 billion solar masses and as high as 2 to 3 trillion solar masses.
The new mass estimate puts our galaxy on the beefier side, compared to other galaxies in the universe.
Because dark matter is so hard to calculate, Watkins and her team measured the velocities of dense star clusters, called globular clusters, that orbit the galaxy's spiral disc.
Sudan's Bashir orders release of female detainees
He has been lobbying for Sudan to be removed from a list of countries Washington considers state sponsors of terrorism. Emergency courts have since been trying protesters in evening sessions, sparking more rallies outside court buildings.
Stocks mark first weekly loss since January
A day earlier Europe's central bank said it was doing a policy reversal and restoring measures to shore up that region's economy. A weak report on hiring by US employers last month added to investors' worries about the global economy and sent stocks lower.
Globular star clusters are essentially isolated islands, each containing hundreds of thousands of stars - including the oldest-known stars, dating back to a few hundred million years after the big bang - that orbit the centre of the galaxy. Now, scientists have solved one of the riddle of the Milky Way's weight by combining fresh data from the Gaia mission and the Hubble Space Telescope.
"The more massive a galaxy, the faster its clusters move under the pull of its gravity", explains astrophysicist Wyn Evans of the University of Cambridge in Britain in the ESA statement. "However, we were able to also measure the sideways motion of the clusters, from which the total velocity, and consequently the galactic mass, can be calculated", Evans said.
"We were lucky to have such a great combination of data", explained Roeland P. van der Marel (Space Telescope Science Institute, USA).
"Having motions for more objects would give better accuracy", she told Gizmodo.
Finally, Watkins is also anticipating modelling improvements. For now, we'll have to be content with the new figure of 1.5 trillion solar masses and our slightly heavier-than-average Milky Way.
Omar has garnered attention for her anti-Semitic comments, specifically about Americans' loyalty to Israel. Pirro also issued a statement inviting Omar on her show and insisting she did not call Omar "un-American".
Molinari's was longer than anything Woods ever made, from a slightly different angle. "It's a pretty iconic putt", he said . Notes: Tiger Woods withdrew from the tournament with a neck strain he says has been bothering him for a few weeks.
In Friday night's episode, Lisa said: "It's a bit like how long's a piece of string but the doctors say I've got a while yet". The actress said: "Lisa is so close to my heart as she's been such a huge part of my life for the past more than 23 years".
In 1955, Jenkins finished second in the Fort Worth city championship, an accomplishment he shared with Hogan and Byron Nelson. In 1962, he was hired by Sports Illustrated , where he chronicled the feats of Jack Nicklaus and Arnold Palmer.
Devotees at the Dalai Lama's temple in Dharamsala observed the anniversary Sunday with chants and prayers. Some had "Free Tibet" painted on their faces along with the colours and golden sun of the iconic flag.
The mother of IBF super middleweight champion Caleb Plant was killed early Saturday morning in an officer-involved shooting. You had your demons but you'd give the shoes off your feet and your last dollar to someone who needed it less than you.
Brown will receive a new three-year deal worth up to $54.125 million, with $30.125 million guaranteed, the source said. Osemele, 29, is a two-time Pro Bowl selection (2016-17) who could provide an upgrade on New York's offensive line.
At 21:46 GMT, the AUD/USD is trading.7031, down 0.0054 or -0.75%, and the NZD/USD is at.6770, down 0.0028 or -0.42%. Overall, this reflects the poor state of the economy and the fact that there are clearly some concerns for the RBA.
But every five years, it holds an election for the rubber-stamp legislature, known as the Supreme People's Assembly. Voting began at around 9am local time (midnight GMT) depending on the location and continues until late evening.
The former partner of paedophile Premier League player Adam Johnson has revealed she underwent an abortion following his arrest. The 29-year-old said her life "fell apart" when Johnson first appeared in court.
Filipino comedian Chokoleit dies aged 46
He was rushed to the Abra Provincial Hospital, where he died of a pulmonary edema and heart attack, his physician has confirmed. Creamline Cool Smasher Alyssa Valdez knew this all along, and offered her tribute to the departed showman.
PE man almost swallowed by a whale
The tour operator takes tourists on a once in a lifetime whale watching in Algoa Bay. "Whales are not man-eaters". This was no attack, it was not the fault of the whale, and they are really sensitive.
Backed forces attack last ISIS stronghold in Syria
But some IS militants are refusing to leave the small patch of land and are vowing to continue their fight. Aid agencies are struggling to cope with the thousands of weak and hungry people who have fled Baghouz.
Yarde, Dubois ready to grace iconic Royal Albert Hall
Yarde (17-0, 16 KOs) has knocked out 15 opponents in a row, a streak that dates back to his second professional bout in June 2015. His only decision victory came in his last bout, a dominant performance over veteran Kevin Johnson that streamed on ESPN+.
Out-of-service bus explodes in Stockholm
Sweden's Aftonbladet newspaper reported the bus driver was rushed to the hospital but no one else was known to have been injured. Police spokeswoman Carina Skagerlind told the newspaper an out-of-service city bus powered by natural gas caught fire.