Some of the black holes are oddball objects dubbed 'hot DOGs.'
The tracks made by Mars rover Curiosity call to mind the bootprints left on the moon by Neil Armstrong.
Earthlings will become virtual Martians as they live and work on a Mars schedule to control NASA's new rover.
New photos show the moving shadows cast by the American flags planted by Apollo astronauts on the moon.
Physicists have estimated a limit for the number of different atomic nuclei variations that can be created.