00:04Super-Earths are a lot like, well, Earth.
00:07They're rocky worlds rather than ones made of gas or ice, and sometimes they have water.
00:11However, astronomers say that Super-Earth 55 Cancri e, also known as Janssen,
00:16might be more Earth-like than any other found before.
00:18Janssen is around 8.8 times the mass of Earth,
00:21and orbits one of the closest stars to our own system, called Copernicus, just 41 light-years away.
00:26What sets Janssen apart from other exoplanets of its kind, however,
00:30is that researchers have just discovered the first evidence that suggests it might have an atmosphere.
00:34The discovery was made using the James Webb Space Telescope.
00:37However, despite this new discovery and its relative proximity to our own solar system,
00:42experts say it's not a likely candidate for humanity to travel to.
00:45That's because it orbits Copernicus so closely that a year on Janssen only lasts 18 hours.
00:51That proximity to its host star means that the surface is a veritable hellscape,
00:55with temperatures on the ground reaching upwards of 4,172 degrees Fahrenheit.
01:00So how does Janssen still have an atmosphere?
01:02Experts say that an ancient atmosphere rich in helium and hydrogen is probably off the table,
01:06pointing instead to one made primarily of carbon monoxide and CO2,
01:10with the atmosphere being constantly re-upped by the outgassing from the molten surface.
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