Astronomers Have Discovered The Most Inhospitable ‘Hell’ Planet Ever That Rains Rocks

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Astronomers have discovered the most inhospitable ‘hell’ planet ever that rains rocks with 60-mile-deep lava seas and winds of more than 3,000 mph

A recently discovered ‘hell planet’ has been found to have some of the most ‘extreme’ conditions in the universe, with raining rocks and 60-mile deep lava seas.

The world, named K2-141b, was found around 200 light years away from Earth and has winds of more than 3,000 mph and surface temperatures over 5,000F.

Researchers from McGill and York University are the first to predict the weather on the rocky planet, which was first discovered by the Kepler Space Telescope in 2018.

The world is tidally locked, meaning one side always faces its host star, with endless daylight resulting in temperatures that are hot enough to vaporise rock.

The other side, facing away from the star, is a freezing -328F, which is cold enough to freeze nitrogen – the vast difference creates the intense 3,000 mph winds.

K2-141b is a ‘super Earth’, a category of planet not found in the solar system. It is about the five times the size of our world but takes just 0.3 days to orbit its star.

It orbits its just 665,000 miles from its orange dwarf host star, in comparison Mercury orbits an average of 36 million miles from the Sun.

Lead author Giang Nguyen, a PhD student, said the fiery hot world has a surface, ocean and atmosphere all made up of rocks – from molten lava to falling stones.

Nguyen and colleagues created a series of computer simulations to predict what the weather would be like on this extreme example of an ‘Earth-like’ planet.

The exoplanet belongs to a subset of rocky planets that orbit very close to their star, explained the researchers, adding the extreme conditions may change the surface.

This proximity to the star keeps the planet gravitationally locked in place with the same side always facing it – ultimately creating a thin atmosphere in some areas.

Co author Professor Nicolas Cowan, of McGill University, Montreal, said: ‘Our finding likely means the atmosphere extends a little beyond the shore of the magma ocean, making it easier to spot with space telescopes.’

The vaporised atmosphere mimics Earth’s – only with rocks instead of water – with extreme heat causing them to undergo precipitation as if they were water particles.

Just like the water cycle on Earth where it evaporates, rises into the atmosphere, condenses, and falls back as rain, so too does the sodium, silicon monoxide and silicon dioxide on K2-141b – it effectively rains rocks.

On Earth, rain flows back into the oceans, where it will once more evaporate and the water cycle is repeated – in a stable cycle.

On K2-141b, the mineral vapour formed by evaporated rock is swept to the frigid night side by supersonic winds and rocks ‘rain’ back down into a magma ocean.

Still, the cycle on K2-141b is not as stable as the one on Earth, say the scientists as the return flow of the magma ocean to the day side is very slow.

As a result, they predict that the mineral composition will change over time – eventually altering the very surface and atmosphere of K2-141b.

Cowan said: ‘All rocky planets­, including Earth, started off as molten worlds but then rapidly cooled and solidified. Lava planets give us a rare glimpse at this stage of planetary evolution.’

The next step will be to test if these predictions are correct, say the scientists.

The team now has data from the Spitzer Space Telescope that should give them a first glimpse at the day-side and night-side temperatures of the exoplanet.

With the James Webb Space Telescope launching in 2021, they will also be able to verify whether the atmosphere behaves as predicted.

Added Mr Nguyen: ‘Next-generation space telescopes such as the James Webb will be able to detect it from hundreds of light years away.’

The findings have been published in the journal Monthly Notices of the Royal Astronomical Society.

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