OEAW "travel guide" to the most inhospitable planets
Thus, eternal night reigns on the planet PSR J1719-1438 b. But that would not be the worst: The planet is exposed to such extreme radiation that human DNA would be destroyed immediately, explains Luca Fossati, an expert on exoplanets, on the OEAW website.
KELT-9b, on the other hand, which was only discovered in 2017, is the hottest planet we know of. Temperatures of up to 5,000 degrees Celsius prevail on it. The temperatures are caused by a nearby hot star that constantly shines on KELT-9b. The hot side of KELT-9b gets 44,000 times more energy than Earth gets from the Sun.
The planet PSO J 318.5-22 turns out to be the opposite of the hot KELT-9b. PSO J 318.5-22 drifts alone through space and is terribly cold. The temperature on its surface is minus 200 degrees. But there is no ice on its surface, it is a pure gas shell.
Planet AU Mic b is a planet orbiting a young star. This star literally bombards the planet with powerful X-rays, so that every ten minutes small explosions occur on the surface of the planet. Why this happens is still unclear.
The cannibalism victim
The extrasolar planet WASP-12b is currently orbiting its sun at such a short distance that it is being "eaten" by it. It is constantly losing atmosphere, and the sun is sucking in its hull. It is not yet known how long the "feast" will last - from a few million years to a billion years, according to Luca Fossati in his presentation of the five inhospitable planets.
For those interested, the ÖAW offers scientific illustrations of the five inhospitable planets on its website, which can be downloaded free of charge and used, for example, as zoom backgrounds.
Download them HERE.