Latest news with #Andromeda
Malay Mail
29 minutes ago
- General
- Malay Mail
‘It's basically a coin flip': Study says galactic doom from Milky Way-Andromeda crash not guaranteed after all
PARIS, June 3 — The Milky Way may not have a catastrophic collision with another huge galaxy as has been predicted, computer simulations revealed yesterday, giving our home galaxy a coin-flip chance of avoiding destruction. But don't worry either way: no galactic smash-up is expected for billions of years, long after our ageing Sun will have burnt away all life on Earth. The Milky Way and the even-larger galaxy Andromeda are speeding towards each other at 100 kilometres a second, and scientists have long predicted they will collide in around 4.5 billion years. That would be bad news for our neighbourhood. Previous research has suggested that the Sun — and our Earth — could wind up in the centre of this newly merged 'Milkomeda' galaxy and get sucked into its supermassive black hole. Alternatively, the Sun could be shot out into the emptiness of intergalactic space. However 'proclamations of the impending demise of our galaxy seem greatly exaggerated', according to a new study in the journal Nature Astronomy. There is only a roughly 50 percent chance the Milky Way and Andromeda will smash into each other in the next 10 billion years, the international team of astrophysicists determined. 'It's basically a coin flip,' lead study author Till Sawala of the University of Helsinki told AFP. The researchers ran more than 100,000 computer simulations of our universe's future, using new observations from space telescopes. A galaxy merger in the next five billion years is 'extremely unlikely', Sawala said. Much more likely is that the galaxies will zoom relatively close to each other — say, a little under 500,000 light years away. In only half of the simulations did dark matter then eventually drag the two galaxies together into a cataclysmic embrace. But this would likely only occur in around eight billion years — long after our Sun has died, the researchers found. 'So it could be that our galaxy will end up destroyed,' Sawala said. 'But it's also possible that our galaxy and Andromeda will orbit one another for tens of billions of years — we just don't know.' Galaxy's fate 'open' 'The fate of our galaxy is still completely open,' the study summarised. The researchers emphasised that their findings did not mean that previous calculations were incorrect, just that they had used newer observations and taken into account the effect of more satellite galaxies. Future data releases from Europe's recently retired Gaia space telescope as well as Hubble could provide a definitive answer to this question within the next decade, Sawala predicted. How much all this all matters to us is a matter of debate. The Sun is expected to make Earth inhospitable to life in around a billion years. 'We might have some emotional attachment' to what happens after we're gone, Sawala said. 'I might prefer the Milky Way not to collide with Andromeda, even though it has absolutely no relevance to my own life — or the lives of my children or great-great grandchildren.' — AFP
News.com.au
2 hours ago
- General
- News.com.au
‘Coin flip': 50-50 chance Milky Way will be destroyed in collision with Andromeda galaxy
The Milky Way may not have a catastrophic collision with another huge galaxy as has been predicted, computer simulations revealed Monday, giving our home galaxy a coin-flip chance of avoiding destruction. But don't worry either way: no galactic smash-up is expected for billions of years, long after our ageing Sun will have burnt away all life on Earth. The Milky Way and the even-larger galaxy Andromeda are speeding towards each other at 100 kilometres (60 miles) a second, and scientists have long predicted they will collide in around 4.5 billion years. That would be bad news for our neighbourhood. Previous research has suggested that the Sun — and our Earth — could wind up in the centre of this newly merged 'Milkomeda' galaxy and get sucked into its supermassive black hole. Alternatively, the Sun could be shot out into the emptiness of intergalactic space. However 'proclamations of the impending demise of our galaxy seem greatly exaggerated', according to a new study in the journal Nature Astronomy. There is only a roughly 50 per cent chance the Milky Way and Andromeda will smash into each other in the next 10 billion years, the international team of astrophysicists determined. 'It's basically a coin flip,' lead study author Till Sawala of the University of Helsinki told AFP. The researchers ran more than 100,000 computer simulations of our universe's future, using new observations from space telescopes. A galaxy merger in the next five billion years is 'extremely unlikely', Sawala said. Much more likely is that the galaxies will zoom relatively close to each other — say, a little under 500,000 light years away. In only half of the simulations did dark matter then eventually drag the two galaxies together into a cataclysmic embrace. But this would likely only occur in around eight billion years — long after our Sun has died, the researchers found. 'So it could be that our galaxy will end up destroyed,' Sawala said. 'But it's also possible that our galaxy and Andromeda will orbit one another for tens of billions of years — we just don't know.' 'The fate of our galaxy is still completely open,' the study summarised. The researchers emphasised that their findings did not mean that previous calculations were incorrect, just that they had used newer observations and taken into account the effect of more satellite galaxies. Future data releases from Europe's recently retired Gaia space telescope as well as Hubble could provide a definitive answer to this question within the next decade, Sawala predicted. How much all this all matters to us is a matter of debate. The Sun is expected to make Earth inhospitable to life in around a billion years. 'We might have some emotional attachment' to what happens after we're gone, Sawala said. 'I might prefer the Milky Way not to collide with Andromeda, even though it has absolutely no relevance to my own life — or the lives of my children or great-great grandchildren.'
Express Tribune
4 hours ago
- Science
- Express Tribune
'From near-certainty to a coin flip'
The Milky Way may not have a catastrophic collision with another huge galaxy as has been predicted, computer simulations revealed Monday, giving our home galaxy a coin-flip chance of avoiding destruction. But don't worry either way: no galactic smash-up is expected for billions of years, long after our ageing Sun will have burnt away all life on Earth. The Milky Way and the even-larger galaxy Andromeda are speeding towards each other at 100 kilometres (60 miles) a second, and scientists have long predicted they will collide in around 4.5 billion years. That would be bad news for our neighbourhood. Previous research has suggested that the Sun -- and our Earth -- could wind up in the centre of this newly merged "Milkomeda" galaxy and get sucked into its supermassive black hole. Alternatively, the Sun could be shot out into the emptiness of intergalactic space. However, "proclamations of the impending demise of our galaxy seem greatly exaggerated", according to a new study in the journal Nature Astronomy. There is only a roughly 50 per cent chance the Milky Way and Andromeda will smash into each other in the next 10 billion years, the international team of astrophysicists determined. "It's basically a coin flip," lead study author Till Sawala of the University of Helsinki told AFP. The researchers ran more than 100,000 computer simulations of our universe's future, using new observations from space telescopes. AFP
CNN
4 hours ago
- General
- CNN
Once inevitable collision between Milky Way and Andromeda galaxies now seems less likely, astronomers say
A collision between our Milky Way galaxy and its largest neighbor, the Andromeda galaxy, predicted to occur in about 4.5 billion years, has been anticipated by astronomers since 1912. But new research suggests that the likelihood of this galactic clash, dubbed 'Milkomeda,' is smaller than it seems. At first glance, it appears likely that the galactic duo — separated by about 2.5 million light-years — is on an inevitable collision course. The Milky Way and Andromeda are barreling toward each other at about 223,694 miles per hour (100 kilometers per second). However, the Local Group, or our corner of the universe, includes 100 known smaller galaxies. A team of astronomers factored in some of the largest among them, including the Large Magellanic Cloud, or LMC, and M33, or the Triangulum galaxy, to see how much of a role they might play on the chessboard of our galaxy's future over the next 10 billion years. After factoring in the gravitational pull of Local Group galaxies and running 100,000 simulations using new data from the Hubble and Gaia space telescopes, the team found there is about a 50% chance of a collision between the Milky Way and Andromeda in the next 10 billion years. There is only about a 2% chance the galaxies will collide in 4 to 5 billion years as previously thought, according to the study published Monday in the journal Nature Astronomy. A merger of the Milky Way and Andromeda galaxies would destroy them both, eventually turning both spiral structures into one elongated galaxy, the study authors said. Collisions between other galaxies have been known to create 'cosmic fireworks, when gas, driven to the center of the merger remnant, feeds a central black hole emitting an enormous amount of radiation, before irrevocably falling into the hole,' said study coauthor Carlos Frenk, professor at Durham University in England. 'Until now we thought this was the fate that awaited our Milky Way galaxy,' Frenk said. 'We now know that there is a very good chance that we may avoid that scary destiny.' However, there are many unknown factors that make it difficult to predict the ultimate fate of our galaxy, according to the study authors. And, Frenk warns, the Milky Way has a greater chance of colliding with the LMC within 2 billion years, which could fundamentally alter our galaxy. The LMC orbits the Milky Way, while M33 is a satellite of Andromeda. The LMC's mass is only about 15% of the Milky Way's. But the team found that the satellite galaxy has a gravitational pull, perpendicular to Andromeda, that changes the Milky Way's motion enough to reduce the chance of a merger between the two giant galaxies. It's a similar case for M33. 'The extra mass of Andromeda's satellite galaxy M33 pulls the Milky Way a little bit more towards it,' said lead study author Dr. Till Sawala, astronomer at the University of Helsinki in Finland. 'However, we also show that the LMC pulls the Milky Way off the orbital plane and away from Andromeda. It doesn't mean that the LMC will save us from that merger, but it makes it a bit less likely.' Previous research also has assumed most likely values for unknown data, such as the uncertainties in the present positions, motions and masses of the Local Group galaxies. In the new study, the team accounted for 22 different variables, including those unknowns, that could contribute to a collision. 'We ran many thousands of simulations, which allowed us to account for all the observational uncertainties,' Sawala said. 'Because there are so many variables that each have their errors, that accumulates to rather large uncertainty about the outcome, leading to the conclusion that the chance of a direct collision is only 50% within the next 10 billion years.' In just over half of the simulations predicting what could occur in 8 to 10 billion years, the Milky Way and Andromeda galaxies initially sailed somewhat closely past each other before circling back and then losing enough orbital energy to collide and merge as one galaxy. These initial close encounters between each galaxy's halo — a large envelope of gas — would eventually lead to a collision. 'In general, the merger would most likely involve a strong starburst, during which many new stars would form, followed by a period of intense radiation caused by exploding young stars and the newly active supermassive black hole, eventually shutting down star formation completely,' Sawala said. 'A few billion years later, any traces of the former Milky Way and Andromeda would disappear, and the remnant would be a largely featureless elliptical galaxy.' In the other simulations, both galaxies crossed paths without disturbing each other. Geraint Lewis, a professor of astrophysics at the University of Sydney's Institute for Astronomy, finds the results showing the gravitational influence of M33 and the LMC interesting. He has previously authored research on a potential collision between Andromeda and the Milky Way. 'We won't know if the collision is definitely off in the future, but this clearly shows that the story that people tell — that there will be a collision that will destroy the Milky Way and Andromeda — is not as clear or certain that people think,' Lewis said. 'But even if there is a pretty close encounter rather than smashing head-on, the gravitational tearing that each will assert on each other is likely to leave the two large galaxies in a sorry state.' While including the LMC's gravitational effects on the Milky Way is important, accounting for uncertainties is the most important aspect of the new study, said Scott Lucchini, a postdoctoral fellow in the Institute for Theory and Computation at the Center for Astrophysics, Harvard & Smithsonian. 'Here, they've sampled from the uncertainties in the positions, velocities, and masses of the galaxies to obtain the relative probabilities of different outcomes,' Lucchini wrote in an email. 'This really gives us the whole picture of what could happen in the future.' Galaxies are full of intricacies. Their shapes can become distorted, interactions can change their orbits and they can lose mass in different ways. Such complexities make predictions difficult, Lucchini said. That essentially leaves the fate of the Milky Way 'completely open,' the study authors wrote in the new paper. However, more data coming from the Gaia space telescope in the summer of 2026 will provide measurements that refine some of the uncertainties about the speed and direction at which Andromeda is moving across the sky, Sawala said. The fate of the sun may have a bigger impact on Earth's future than the motions of galaxies, according to the researchers. Our sun is 4.5 billion years old. When it starts to die in another 5 billion years, it will swell into a red giant that engulfs Mercury, Venus and potentially Earth, according to NASA. 'The short answer is that the end of the sun is far worse for our planet than the collision with Andromeda,' Sawala said. 'While that merger would mean the end of our galaxy, it would not necessarily be the end of the sun or the Earth. Although our work also shows that earlier studies, that purported to predict precisely what the fate of the solar system would be after the merger, were clearly premature, in general, collisions between stars or planets are extremely rare during galaxy mergers. And while the end of the sun is certain, our study shows that the end of the galaxy is anything but.' While the team didn't model a merger between the LMC and the Milky Way in detail, they found a 'virtual certainty' that a merger between the two galaxies will occur within the next 2 billion years, which aligns with previous research, Sawala said. But the effects will likely be more minor than a merger between the Milky Way and Andromeda. 'The merger (between the Milky Way and the LMC) will not destroy our galaxy but it will change it profoundly, particularly impacting our central supermassive black hole and the galactic halo,' Frenck wrote in an email. He also served as a coauthor on a 2019 paper on the potential merger.
The Independent
6 hours ago
- General
- The Independent
Scientists have big rethink on possible Milky Way collision
Nasa scientists initially predicted that the Milky Way and Andromeda galaxies would collide in four billion years. A new study published in Nature Astronomy, based on 100,000 simulations using data from Nasa's Hubble and the European Space Agency's Gaia space telescopes, indicates only a 2 per cent chance of a collision between the Milky Way and Andromeda in the next five billion years. The simulations suggest that in many scenarios, the galaxies will have close encounters but avoid a direct collision. They may potentially merge in eight to 10 billion years, by which time the sun may have already died. The updated findings incorporate the gravitational effects of the Large Magellanic Cloud, a dwarf galaxy orbiting the Milky Way, which influences the motion of the Milky Way and reduces the likelihood of a merger with Andromeda.
