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They discover signs of what could be the first planet discovered outside the Milky Way

  • Paul Rincon
  • BBC News Science Editor

image source, ESO / L. Sidewalk

to explain,

The discovery stems from an X-ray binary: a neutron star or black hole extracting gas from a companion star.

If astronomers are correct, this will be the first planet discovered outside our galaxy.

So far, about 5,000 “exoplanets” have been identified – defined as worlds orbiting stars other than our sun – but all of them have been located within our galaxy, the Milky Way.

The possible signal of the planet detected by NASA’s Chandra X-ray telescope is located in the Messier 51 galaxy, about 28 million light-years away from the Milky Way.

This discovery is based on the so-called transit, which A planet passing in front of a star blocks part of the star’s light and results in a certain decrease in its brightness which can be detected by telescopes.

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