Question: what is the sound of one star magnetically cycling? If it's the star affectionately known as HD 49933, it sounds for all the world like a bell ringing.
What seems to be angering the supermassive black holes inside distant, yet powerful, radio galaxies?
What may end up being the crown jewel of the International Space Station landed at the Kennedy Space Center in Florida on Thursday to begin preparations for launch on the last shuttle mission in February.
The Earth isn't the only planet to have aurorae. Saturn, the ringed gas giant, is also crowned with light -- but this light could explain a mystery first observed by the Voyager probes.
The cosmos is expanding at an accelerated rate due to a mysterious force called dark energy. Are we getting close to understanding its true nature?
A meteorite pushes back the age of the solar by almost 2 million years.
The powerful radio source in the center of M87 is a supermassive black hole, ripping away at the heart of the galaxy.
What's in a neutron star? Well, neutrons, obviously. However, despite the deceptively simple label, the inner workings of neutron stars remain elusive. But that could soon change.
Giant planets have been detected in distant solar systems but most of these planets could not have Earth-like moons.
A decade ago it would have been hard to predict what would have made it to the top of the list of cosmic mysteries now confronting astronomers.