re gamma ray bursters where are they kwp wag caltech edu kevin w plaxco writes in article apr stdvax gsfc nasa gov abdkw stdvax gsfc nasa gov david ward writes demonstrating that these puppies are beyond the oort cloud would require resolution on the order of arcseconds since the oort cloud is postulated to extend to about parsec all together now parallax arc second a parsec is the distance of an object that demonstrates one arc second of parallax with a au base line according to my glossary of astronomy and astrophysics parsec abbreviation for parallax second the distance at which one astronomical unit subtends an angle of second of arc pc au x km lt yr george george krumins the serpent and the rainbow gfk uxa cso uiuc edu pufferfish observatory o
