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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Collisional ring galaxies occur when a larger galaxy (typically 30,000 to 50,000 light years in diameter) is impacted head-on along its polar axis by a smaller dwarf galaxy (typically 5,000 to 10,000 light years in diameter). The collision creates an expanding density wave of star formation in the larger galaxy, leading to the formation of a hole in the larger galaxy which usually develops into a ring. Surprisingly, the small galaxy often remains relatively intact.