A neutron star can pack more mass than our entire Sun into a sphere only about 20 kilometres across — roughly the size of a city — and a teaspoon of its material would weigh about a billion tonnes on Earth, more than every human being alive combined.

Ultraheavy nuclei may explain origins of highest-energy cosmic rays, Penn State study finds

New research led by Penn State scientists suggests that ultrahigh-energy cosmic rays—including the record-breaking "Amaterasu particle" dete

Hubble Reveals Half a Million Stars in Milky Way's Nuclear Star Cluster

NASA's Hubble Space Telescope has captured a deep view of the Milky Way's nuclear star cluster, revealing more than half a million stars pac

The Pair Instability Mass Gap: Why Some Stars Are Too Massive to Form Black Holes

This newsletter edition discusses the upper mass limit for stellar-mass black holes formed via supernovae, specifically the "pair instabilit

New AI model reveals how neutron star mergers forge heavy elements

Astronomers witness the birth of a magnetar for the first time

Six New Millisecond Pulsars Discovered Using FAST Telescope Data Stacking

Researchers using China's FAST telescope (the world's largest single-dish radio telescope) have discovered six previously undetected millise