Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
July 3, 1996
Superbubbles in the LMC
Credit and Copyright: C. Smith (U. Michigan), Curtis Schmidt Telescope, CTIO, Chile
Explanation: Why is there a hole in the centre of this nebula? A leading explanation is that it is caused by the stellar winds from the stars that live there. Stars - including the Sun - expel electrons, protons, and other charged ions in a steady stream - the stellar wind. The wind ions push out the normal hydrogen and helium gas found glowing in the nebula. This star forming region is located in the Large Magellanic Cloud. This picture is a composite of three separate photographs, each sensitive to only one specific colour of light - a colour that distinguishes a specific chemical element. It is currently not known why stars emit a stellar wind.
Authors & editors:
NASA Technical Rep.: Jay Norris. Specific rights apply.
A service of: LHEA at NASA/ GSFC
&: Michigan Tech. U.