Henize 70: A SuperBubble In The LMC . ... Credit Copyright: Anglo-Australian Telescope Board Explanation: Massive stars (tens of times the mass of the Sun) profoundly affect their galactic environment. ... It is actually a luminous "superbubble" of interstellar gas about 300 lightyears in diameter, blown by winds from hot, massive stars and supernova explosions , its interior filled with tenuous hot expanding gas. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...