Time may be running out for the Great Red Spot.
Space-time ripples show how quickly our Universe expanded.
High-energy emissions at a dead star’s core show how it exploded.
Amid cloudy skies, a nearby stellar explosion is spotted.
Telescope observations reveal atmospheric water on exoplanets.
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.
Two giant galaxies combine to form a massive ellipse.