NASA astronomers have discovered a distant alien planet with a “primitive atmosphere” which shows signs of having water.

The planet known as HAT-P-26b, which is a massive 437 light years from Earth, has been referred to as a “warm Neptune” due to it having a similar mass to the one in our solar system.

But the planet sits much closer to its host star.

What stunned researchers is that the planet’s atmosphere is made up almost entirely of hydrogen and helium, which is unusual for a planet so close to its host star – so close in fact that it takes just 4.23 days to orbit.

Analysis of the planet revealed it also has a strong water signature and is relatively clear of clouds.

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