Looming clash between Milky Way, Andromeda may not happen after all
The Hindu
Milky Way and Andromeda galaxies may not collide, with 50-50 odds in 10 billion years, according to astronomers.
It turns out that looming collision between our Milky Way and Andromeda galaxies might not happen after all.
Astronomers reported Monday 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’s 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.
While good news for the Milky Way galaxy, the latest forecast may 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 email.
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 will engulf Mercury, Venus, and possibly the earth. Even if it doesn’t swallow the earth, the home planet will 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 neighbour Andromeda. Both already collided with other galaxies in their ancient past and, according to many, seemed destined for a head-on crash.
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