On September 5, the European Space Agency's Rosetta mission became the first spacecraft to take a close-up portrait of a rare type of asteroid that lies in the main belt, between the orbits of Mars and Jupiter.

New radio wave observations are giving astronomers their closest look yet at the supermassive black hole believed to be lurking at the center of our galaxy.

In sifting through the ashes of a short-lived subatomic particle called the kaon, physicists are slowly accumulating new hints that the theory of elementary particles might one day have to be modified.

Possible comet may be distant visitor from the innermost region of the Oort Cloud, the proposed comet reservoir of the outermost solar system.

Swooping within 49 kilometers of Saturn’s tiny, geologically active moon Enceladus, the Cassini spacecraft has pinpointed the locations of the icy geysers that erupt from the southern hemisphere of this wrinkled moon’s surface.

To celebrate the Hubble Space Telescope’s 100,000th orbit about Earth, astronomers aimed the observatory at a firestorm of stellar activity in the Large Magellanic Cloud, a satellite galaxy of the Milky Way.

Researchers have developed a new and accurate simulation of the birth of the first stars in the universe.

A Greek gadget discovered more than a century ago in a 2,100-year-old shipwreck not only tracked the motion of heavenly bodies and predicted eclipses, but also functioned as a sophisticated calendar and mapped the four-year cycle of the ancient Greek Olympics.

After years of speculation, planetary scientists have now confirmed that Titan has at least one lake made of liquid ethane.

Astronomers have discovered the first known triple near-Earth asteroid.

New observations are further eroding the difference between asteroids and comets.

The largest asteroid in the solar system may not be an asteroid at all but a cometlike relative of Pluto that came in from the cold several billion years ago.

Observing the dusty center of the Milky Way, astronomers have the second brightest star known in the galaxy