Black holes, space travel and comet chases

Galaxies Collide in the Antennae Galaxies (NASA, Chandra, Hubble, Spitzer, 08/05/10) Credit @ Harvard-Smithsonian Center for Astrophysics

Galaxies Collide in the Antennae Galaxies (NASA, Chandra, Hubble, Spitzer, 08/05/10) Credit @ Harvard-Smithsonian Center for Astrophysics

Galaxies Collide in the Antennae Galaxies (NASA, Chandra, Hubble, Spitzer, 08/05/10) Credit @ Harvard-Smithsonian Center for Astrophysics