The United Nations calls for an asteroid defense plan.
Constant vigilance rewards hobbyist astronomers.
A pulsing star at our galaxy’s heart shares a black hole’s secrets.
Observations of a star’s magnetic field reveal unusual behavior.
Watch the latest Mars rover hunt for signs of life.
Two giant galaxies combine to form a massive ellipse.
Planet-forming particles swarm an unlikely star host.
Plentiful ice in the Saturn system hints at its age.
Astronomers measure how fast a black hole spins.
A river valley found on a distant moon resembles Earth’s Nile.