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Scientists long suspect there is a global ocean under the surface of Europa. It is hidden under a thick ice crust with faults through which water escapes to a very thin atmosphere. New analysis of old Hubble data now show even more water vapor, this time sublimating from surface.
Astronomers led by Byeong-Cheol Lee have made a groundbreaking discovery, detecting a brown dwarf orbiting the red giant HD 18438. With a radius of 89 times that of the Sun, HD 18438 is now the largest known star to be orbited by an exoplanet or brown dwarf.