13 Oct 2020, 13:00 UTC
Illustration: NASA, ESA, and G. Bacon (STScI); Science: NASA, ESA, and T. Evans (University of Exeter)
With over 4,200 exoplanets now found — alien worlds orbiting other stars — we're bound to see some that are extreme.
But there's extreme, and there's extreme. WASP-121b is the latter. Hard core. Heavy metal, even.