As a star's shell explodes outward, its core squeezes inward. The result can be a black hole or neutron star. This highly distorted supernova remnant, called may contain the most recent black hole formed in the Milky Way galaxy.
Photo by Steven Gilbert. Sun partially eclipsed on the top left by the Moon is also seen eclipsed by earthlings contemplating the eclipse below. The menagerie of silhouettes was taken from the Glen Canyon National Recreation Area near Page, Arizona, USA.
This image comes from a very deep Chandra observation of the Tycho supernova remnant. Low-energy X-rays (red) in the image show expanding debris from the supernova explosion and high energy X-rays (blue) show the blast wave, a shell of extremely energetic
When the Chandra X-Ray Space Telescope observed Jupiter for its entire rotation, the northern auroral X-rays were discovered to be due to a single 'hot spot' that pulsates with a period of 45 minutes, similar to high-latitude radio pulsations.