It turns out that looming collision between our Milky Way and Andromeda galaxies might not happen after all.
Astronomers on Monday said that the probability of the two spiral galaxies colliding is less than previously thought, with a 50-50 chance within the next 10 billion years. That is essentially a coin flip, but still better odds than previous estimates and farther out in time.
“As it stands, proclamations of the impending demise of our galaxy seem greatly exaggerated,” the Finnish-led team wrote in a study appearing in Nature Astronomy.
Photo: Reuters
While good news for the Milky Way galaxy, the latest forecast might be moot for humanity.
“We likely won’t live to see the benefit,” lead author Till Sawala of the University of Helsinki said in an e-mail.
Already more than 4.5 billion years old, the sun is on course to run out of energy and die in another 5 billion years or so, but not before becoming so big it would engulf Mercury, Venus and possibly Earth. Even if it does not swallow Earth, the home planet would be left a burnt ball, its oceans long since boiled away.
Sawala’s international team relied on the latest observations by NASA’s Hubble Space Telescope and the European Space Agency’s Gaia star-surveying spacecraft to simulate the possible scenarios facing the Milky Way and next-door neighbor Andromeda.
Both already collided with other galaxies in their ancient past and, according to many, seemed destined for a head-on crash.
Past theories put a collision between the two — resulting in a new elliptical galaxy dubbed Milkomeda — as probable if not inevitable. Some predictions had that happening within 5 billion years, if not sooner.
For this new study, the scientists relied on updated galaxy measurements to factor in the gravitational pull on the Milky Way’s movement through the universe. They found that the effects of the neighboring Triangulum galaxy increased the likelihood of a merger between the Milky Way and Andromeda, while the Large Magellanic Cloud decreased those chances.
Despite lingering uncertainty over the position, motion and mass of all these galaxies, the scientists ended up with 50-50 odds of a collision within the next 10 billion years.
“The fate of our Milky Way galaxy is a subject of broad interest — not just to astronomers,” said Raja GuhaThakurta of the University of California, Santa Cruz, who was not involved in the study,
A full-on collision would transform our home galaxy from a disk of stars seen as a milky band of diffuse light across the sky into a milky blob, he said.
A harmless flyby of the two galaxies could leave this stellar disk largely undisturbed, thus preserving our galaxy’s name.
More work is needed before the Milky Way’s fate can be predicted with accuracy, the researchers said. Further insight should help scientists better understand what is happening among galaxies even deeper in the cosmos.
While our galaxy’s fate remains highly uncertain, the sun’s future is “pretty much sealed,” Sawala said.
“Of course, there is also a very significant chance that humanity will bring an end to itself still much before that, without any need for astrophysical help,” he said.
Drug lord Jose Adolfo Macias Villamar, alias “Fito,” was Ecuador’s most-wanted fugitive before his arrest on Wednesday, more than a year after he escaped prison from where he commanded the country’s leading criminal gang. The former taxi driver turned crime boss became the prime target of law enforcement early last year after escaping from a prison in the southwestern port of Guayaquil. Ecuadoran President Daniel Noboa’s government released “wanted” posters with images of his face and offered US$1 million for information leading to his capture. In a country plagued by crime, members of Fito’s gang, Los Choneros, have responded with violence, using car
The team behind the long-awaited Vera Rubin Observatory in Chile yesterday published their first images, revealing breathtaking views of star-forming regions as well as distant galaxies. More than two decades in the making, the giant US-funded telescope sits perched at the summit of Cerro Pachon in central Chile, where dark skies and dry air provide ideal conditions for observing the cosmos. One of the debut images is a composite of 678 exposures taken over just seven hours, capturing the Trifid Nebula and the Lagoon Nebula — both several thousand light-years from Earth — glowing in vivid pinks against orange-red backdrops. The new image
Canada and the EU on Monday signed a defense and security pact as the transatlantic partners seek to better confront Russia, with worries over Washington’s reliability under US President Donald Trump. The deal was announced after a summit in Brussels between Canadian Prime Minister Mark Carney and European Commission President Ursula von der Leyen and European Council President Antonio Costa. “While NATO remains the cornerstone of our collective defense, this partnership will allow us to strengthen our preparedness ... to invest more and to invest smarter,” Costa told a news conference. “It opens new opportunities for companies on both sides of the
OVERHAUL: The move would likely mark the end to Voice of America, which was founded in 1942 to counter Nazi propaganda and operated in nearly 50 languages The parent agency of Voice of America (VOA) on Friday said it had issued termination notices to more than 639 more staff, completing an 85 percent decrease in personnel since March and effectively spelling the end of a broadcasting network founded to counter Nazi propaganda. US Agency for Global Media (USAGM) senior advisor Kari Lake said the staff reduction meant 1,400 positions had been eliminated as part of US President Donald Trump’s agenda to cut staffing at the agency to a statutory minimum. “Reduction in Force Termination Notices were sent to 639 employees at USAGM and Voice of America, part of a
RSS