Super-Earth K2-3d sits just 150 million light years away from Earth, and is one of the most likely planets we know of to host alien life.
The large planet seems to have all of the right ingredients for aliens to thrive: a bright nearby star, the perfect conditions for hosting liquid water, and a warm, Earth-like climate.
Now, the mysterious planet's upcoming eclipse of the red dwarf star it orbits could finally reveal whether or not K2-3d is hiding extraterrestrial lifeforms.
The Earth-like planet was originally seen crossing its star by Nasa's Kepler space telescope.
Nasa's enormous Hubble telescope will spend about five days over the next year carefully investigating K2-3d.
The hope is that they find a hydrogen-rich atmosphere, or a blanket of clouds, says Dr Björn Benneke at the California Institute of Technology.
Both would be signs of planetary life.
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