An X-ray flash that heralded a supernova
A massive star ends its life in a spectacular collapse: the core compresses into a neutron star or a black hole, while the outer layers fly off in a dazzling supernova.
In the Rhythm of the Universe: Radio Bursts vs. Hubble Tension
The universe is a vast orchestra playing the score of expansion. Galaxies race apart to the beat of inaudible music of dark energy. But here's the trouble: the conductor's baton held by Edwin Hubble, Adam Riess, and Vera Rubin sets two incompatible tempos.