Binary star Porrima in three different years
Porrima, or Gamma Virginis, a binary star system (two stars orbiting one another) photographed in three different years. Porrima is located around 38 million light-years away from Earth in the constellation Virgo. Following the date, under each picture the apparent distance between the two stars is given in arcseconds (1/3600th of a degree)., by DAMIAN PEACH/SCIENCE PHOTO LIBRARY
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