ScienceDaily: Nebulae News |
| Mach 1000 shock wave lights supernova remnant Posted: 25 Nov 2013 01:48 PM PST When a star explodes as a supernova, the material blasted outward from the explosion still glows hundreds or thousands of years later, forming a picturesque supernova remnant. What powers such long-lived brilliance? In the case of Tycho's supernova remnant, astronomers have discovered that a reverse shock wave racing inward at Mach 1000 (1,000 times the speed of sound) is heating the remnant and causing it to emit X-ray light. |
| Pill-popping galaxy hooked on gas Posted: 25 Nov 2013 07:12 AM PST Our Galaxy may have been swallowing "pills" -- clouds of gas with a magnetic wrapper -- to keep making stars for the past eight billion years. |
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