Gary Imm

GaryI

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A backyard amateur astrophotographer enjoying retirement with my wife on beautiful Lake Livingston in Onalaska, Texas, about 90 minutes north of Houston.

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Blue compact dwarf galaxies (BCDs) are small, faint, and blue star-forming galaxies. They are blue because they contain massive young stars that emit high energy radiation. They have little dust and a distinct compact structure. Gas (hydrogen plus helium) contributes between 40% and 95% of the mass of BCDs. Many scientists believe that these small, active galaxies have served as the building blocks for larger galaxy formation.