ngc 7293

How do you calculate ngc 7293?

The Helix Ne bula (also known as NGC 7293 or Caldwell 6) is a planetary nebula (PN) in the constellation Aquarius. The Helix Nebula (also known as NGC 7293 or Caldwell 6) is a planetary nebula (PN) in the constellation Aquarius. Wikipedia The Helix Nebula (also known as NGC 7293 or Caldwell 6) is a … Read more