Scientists have long thought that exoplanets-planets beyond the solar system-were restricted to the confines of our Milky Way.
The university claimed that there has been no evidence of planets in other galaxies until this study. Scientists at the University of Oklahoma have utilised information from NASA's Chandra X-ray Observatory and microlensing, a planet detection technique. To find planets beyond our galaxy, however, something a little more powerful than a star was needed. David Bennett, a gravitational lensing expert at NASA, said the research was "interesting" but the data could be interpreted in a way to suggest the objects were not extragalactic, NBC reported. This light then illuminates things that aren't otherwise visible. "This is very cool science", Guerras added. The mass of the planets range in size from Earth's moon to the massive Jupiter, our solar system's biggest planet. The researchers of the study informed that they have not got any exact details of the planets and neither have they named any planets. Large, heavy objects in space distort the travel of light around them, so by focusing closely on the light that surrounds, say, a heavy neutron star, it's possible to catch a glimpse of what lies behind some of the brighter lights in the sky.
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The planets outside of our galaxy were instead found using a technique called microlensing, which involves two moving stars or objects aligning from the vantage point of Earth.
"These stars are really far away".
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Up until now, while we've been pretty certain that planets must exist in foreign galaxies, we haven't actually be able to spot them-not because they're hiding, but simply because there's a limit to how far our sensors can reach. But the analysis still needs confirmation. This technique made it easier for scientists to make discoveries.
Detecting exoplanets is quite hard, especially outside of our Milky Way galaxy.
That might make this discovery all the more remarkable: the fact that it might not have happened at all. Previous efforts have been databased and archived. But no one has ever spotted an actual planet.
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The new planets have different sizes.