Most pulsar radio emissions are spectrally broader and noisy — not banded so cleanly like the Crab Pulsar. An NASA image of the Crab Nebula seen by the James Webb Space Telescope.

The Crab Nebula, one of the most studied remnants of a supernova explosion observed nearly a thousand years ago, has been revisited by the Hubble Space Telescope. In a recent study available on ArXiv, ...