The discovery could solve the cosmic chicken-and-egg riddle of which came first—galaxies or the supermassive black holes nestled in their cores.

Up and down California's coast, brown pelicans are dying in alarming numbers, and sick and disoriented pelicans have been found wandering on roads and in other unusual places—and scientists are stumped.

Among the surprises scientists have in store for the coming year: Sunken treasures, a new evolution debate, earlier Earths, and a host of revelations about the universe.

Using "Schwarzenegger" strength, the ancient flying reptiles could make a leaping launch from flat ground in less than a second, a new study says.

Medical imaging tools used to peer inside living people have been adapted to create the first virtual fly-though of the remains of a dead star.

A layer of Earth's magnetosphere—the shield that protects Earth from solar winds—has recently come into focus.

The first infrared panorama of the Milky Way's center has revealed a previously unknown population of massive stars scattered across the turbulent zone around our galaxy's core.

The designation of nearly 200,000 square miles of pristine waters as marine monuments, including the deepest place on Earth, will be a "savings account" for the future, one conservationist says.

Saturn's true colors, baby blue stars, and an anniversary on Mars are among the week's best space images.