Discovery Alert: A Planet with a 'Tail' - NASA Science

The Planet WASP-69 b The Discovery The exoplanet WASP-69 b has a “tail,” leaving a trail of gas in its wake. Key Takeaway  WASP-69 b is slowly losing its atmosphere as light hydrogen and helium particles in the planet’s outer atmosphere escape the planet over time. But those gas particles don’t escape evenly around the […]