The cometlike tail of WASP-69b An artist’s impression of exoplanet WASP-69 b orbiting its host star. Credit: Adam Makarenko/W. M. Keck Observatory.

WASP-69, given the formal name Wouri by the International Astronomical Union in 2019, is a K-type star somewhat like our Sun but slightly smaller. The planet with the tail, however, is much ...

Astronomers have discovered that a gigantic planet has been hiding a 350,000-mile-long tail as its atmosphere seeps away. The exoplanet known as WASP-69 is gargantuan—roughly the size of Jupiter ...

The result is a tail like a comet’s that is over 350,000 miles long. ... WASP-69b, a planet orbiting a star 160 light-years away, is the latest addition to the eccentric menagerie.