Space GhostFirst spotted in late 1572, the star explosion known as Tycho's Nova left behind gases glowing with X-rays and radio waves. Observations since 2000 have allowed scientists to make a movie of the supernova's expanding remains.
Photograph by X-ray: NASA/CXC/GSFC/B.Williams et al; Optical: DSS

Week's Best Space Pictures: See a Supernova's Glowing Ghost

Also, the Hubble Space Telescope takes a stunning snapshot of Mars, and one of Saturn's rings gets kinky with two moons.

ByMichael Greshko
May 20, 2016

Feed your need for heavenly views of the universe with our pick of the most awe-inspiring space pictures.

This week, Hubble spots Mars from 50 million miles away, satellites capture a massive wildfire in Canada, and Jupiter's icy moon Europa shows off its enigmatic surface.