Astronomers have discovered a galaxy transforming gas into stars with almost 100 percent efficiency - a rare phase of galaxy evolution that is the most extreme yet observed.
NASA's Hubble Space Telescope has offered astronomers their clearest view yet of Comet ISON, a newly-discovered sun grazer comet that may light up the sky later this year, or come so close to the Sun that it disintegrates.
The European Space Agency's (ESA) Herschel space observatory has solved a long-standing mystery as to the origin of water in the upper atmosphere of Jupiter, finding conclusive evidence that it was delivered by the dramatic impact of comet Shoemaker-Levy 9 in July 1994.
Palomar 2 is part of a group of 15 globulars known as the Palomar clusters. These clusters, as the name suggests, were discovered in survey plates from the first Palomar Observatory Sky Survey in the 1950s, a project that involved some of the most well-known astronomers of the day, including Edwin Hubble.
A few years ago, researchers revealed that the universe is expanding at a much faster rate than originally believed — a discovery that earned a Nobel Prize in 2011.
The first galaxies were small, then eventually merged together to form the behemoths we see in the present universe.
NASA's Hubble Space Telescope has photographed the iconic Horsehead Nebula in a new, infrared light to mark the 23rd anniversary of the famous observatory's launch aboard the space shuttle Discovery on April 24, 1990.
The continuing growth of space debris poses an increasing threat to satellites and space shuttles.
NASA's Kepler mission has discovered two new planetary systems that include three super-Earth-size planets in the "habitable zone," the range of distance from a star where the surface temperature of an orbiting planet might be suitable for liquid water.
Blazars can best be described as the brightest of active galactic nuclei, with many emitting very high-energy gamma rays.
Scientists around the world are celebrating the 50th anniversary of X-ray astronomy this year. Few objects better illustrate the progress of the field in the past half-century than the supernova remnant known as SN 1006.
Like many of his colleagues at NASA's Jet Propulsion Laboratory, Pasadena, California, Shyam Bhaskaran is working a lot with asteroids these days.
An unpiloted Russian Progress cargo ship departed the International Space Station (ISS) early Monday, clearing the way for Moscow's next space freighter.
The change of seasons on Titan is creating new cloud patterns at Titan's south pole.
Dramatic underground explosions, perhaps involving ice, are responsible for the pits inside these two large martian impact craters, recently imaged by the European Space Agency's (ESA) Mars Express.
A new study tracking the "rain" of charged water particles into the atmosphere of Saturn has found there is more of it and it falls across larger areas of the planet than previously thought.
Stars the size of the Sun typically end their lives as tiny and faint white dwarf stars. But as they make the final transition into retirement their atmospheres are blown away into space.
ESA’s Herschel space observatory has provided the first images of a dust belt – produced by colliding comets or asteroids – orbiting a subgiant star known to host a planetary system.
An analysis of X-ray observations from the Japan-led Suzaku satellite indicates that an exploding star observed in 1604 by the German astronomer Johannes Kepler held a greater fraction of heavy elements than the sun.
Mars may have lost much of its original atmosphere, but what's left remains quite active, recent findings from NASA's Mars rover Curiosity indicate.