Stargazers in the northern hemisphere enjoyed the oldest meteor shower known to Earth in August 2015. The annual Perseid shower occurs when pieces of comet Swift-Tuttle hit Earth's atmosphere at more than 133,000 mph and burn up. Here are some stunning images of the 2015 Perseid meteor shower.
~~Supernova Remnant Cassiopeia A (NASA, Chandra) ~ for the first time, a multiwavelength three-dimensional (3-D) reconstruction of a supernova remnant has been created. This stunning visualization of Cassiopeia A (Cas A), the result of an explosion approximately 330 years ago by NASA's Marshall Space Flight Center~~