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NASA discovers first possible planet outside our galaxy | News – Las Vegas, Nevada

Las Vegas, Nevada 2021-10-26 08:04:00 –

Scientists may have detected signs that the planet is passing outside the star Milky Way, Could be the first planet discovered outside our galaxy.

A potential exoplanet was discovered by NASA’s Chandra X-ray Observatory in the Whirlpool Galaxy (Spiral Galaxy Mesier 51 (M51)). NASA said in a press release on Monday.

Exoplanets are planets outside our solar system that normally orbit our own non-solar stars in our galaxies. To date, all other exoplanets have been discovered in the Milky Way, most of them less than 3,000 light-years from Earth.

This extrasolar planet, which may have been newly discovered in the Whirlpool Galaxy, is about 28 million light-years away, thousands of times more than the Milky Way Galaxy.

“We are trying to open up a whole new field for finding other worlds by searching for planetary candidates at X-ray wavelengths, which makes it possible to find them in other galaxies. It’s a strategy, “said Rosanne Distefano, an astronomy instructor. The Harvard & Smithsonian Astrophysical Center in Cambridge, Massachusetts, who led the study, said in a statement.

The team looked for a decrease in X-ray brightness from the bright X-ray binary. This usually includes a black hole that draws gas from a neutron star (when a giant star collapses) or an approaching orbiting star. Matter near neutron stars and black holes is overheated and glows with X-rays.

Because the area that produces bright X-rays is small, the planets that pass in front of it block most or all of the X-rays and are easy to find. This allows exoplanets to be detected at far distances.

However, researchers have to wait a long time to see if they have discovered an extragalactic planet. Due to its large orbit, planetary candidates have not crossed in front of their binary partners for another 70 years. In other words, it can take decades to confirm the observations.

Astrophysicist Nia Imara, co-author of the University of California Santa Cruz, said in a statement, “Unfortunately, to make sure we’re looking at the planet, we’re looking at another transit. You’ll have to wait decades, “he said. “And because of the uncertainty about how long it will take to get going, we don’t know exactly when to look.”

Experts say that if a planet existed, it would have had to survive a supernova explosion that created a neutron star or a black hole. And in the future, companion stars could also explode as supernovae and re-explode the planet with very high levels of radiation.

Researchers have searched archives of both Chandra and the European Space Agency satellite XMM-Newton, which have substantial datasets of about 20 galaxies, and are candidates for more exoplanets in other galaxies. Look for. They add that another interesting research line is to search for X-ray passages in the Milky Way’s X-ray source and discover new planets nearby in anomalous environments.

This study was published in the journal Nature Astronomy.



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