The new paper argues that, in SN 1181, the first phase of the supernova fizzled out and left behind an unusually active ...

NASA’s Chandra Observatory reveals a 25-year time-lapse of Kepler’s Supernova Remnant. Glowing debris expands at different ...

For more than a century, astronomers have known that some “new stars” flaring into view are not births at all but violent outbursts on long‑dead stellar cores. What they lacked was a clear, close look ...