To allay public fears that the next level might not be reached, NASA offers an explanation for an enigmatic 2010 image from the Hubble Space Telescope, showing a galaxy cluster, Abell 68, approximately 2,000,000,000 light years away. In the middle of that cluster, however, is what appears to be an alien from the video game Space Invaders. NASA explains that it’s a visual artifact of gravitational lensing caused by the gravity influence of the foreground galaxies upon the light of galaxies further away in the image. Earth breathes easy once more.
