There are around 300 million planets that exist outside our Solar System but within the Milky Way which could potentially harbour life. According to research from NASA, four of them are within just 30 light-years from Earth, with the closest just 20 light-years away, NASA claims.
They went in search of the Holy grail of astronomical research, scouring for the ‘Goldilock’s Zone’ where life may thrive.
One prerequisite of this is for the star to resemble the Sun, so the researchers looked for distant stars that resemble it in age and temperature.
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