Earlier than one billion years ago, Earth’s magnetic field had to be driven differently than today. But how? And what can we learn from this about magnetic fields on exoplanets?
Sometimes a mystery can hide in apparently plain things. Astronomers have just discovered that a delta Scuti star known for over 40 years is actually something entirely different and full of peculiarities.
Image via M. Garlick/University of Warwick, ESA/Hubble.
A dwarf irregular galaxy in the Lynx-Cancer void is cannibalizing its neighbors.
A star being swallowed by a black hole, and with an unusual host galaxy.
M31 discovered to be blowing vast bubbles of gamma rays, just like our own galaxy.
Red giant stars are bright enough to see at the center of our galaxy, but they are missing. A new study puts stars in a wind tunnel to explore a possible way to dim the lights.