NASA's Swift X-ray Telescope has observed a spinning, crushed core of a massive star suddenly slowing down.
A record-setting blast of gamma rays from a dying star in a distant galaxy has wowed astronomers around the world.
Three unusually long-lasting stellar explosions discovered by NASA's Swift satellite represent a new class of gamma-ray bursts that likely arise from dying stars hundreds of times larger than the sun.
The Swift satellite observed a comet that may become one of the most dazzling seen in decades when it rounds the sun later this year.
NASA's Swift satellite has uncovered the previously unknown remains of a shattered star which ranks among the youngest-known supernova remnants in our Milky Way galaxy.
The Swift team has selected more than 100 images to help celebrate eight years of operations of the satellite's Ultraviolet/Optical Telescope.
High-speed jets launched from active black holes possess fundamental similarities regardless of mass, age or environment, a new study finds.
A new X-ray source in the Andromeda galaxy is the first detection of radio-emitting jets from a stellar-mass black hole outside the Milky Way.
An enormous binary star pair some 4,700 light-years away pounds its surroundings with intense outflows called stellar winds.
Swift recently detected the presence of a previously unknown stellar-mass black hole.
Researchers have observed a distinctive X-ray signal following a black hole's eruption that comes from matter on the verge of falling into it.
Astronomers have made an unparalleled observation: significant changes in the atmosphere of a planet located beyond our solar system.
The Committee on Space Research recently announced an award to NASA Astrophysicist Neil Gehrels for research in space science.
Outbound comet C/2009 P1 (Garradd) provided a nice show for skywatchers last year. Now, it's the target of an ongoing investigation.
Studies using X-ray and ultraviolet observations from NASA's Swift satellite are providing new insights into the elusive origins of an important class of exploding star, called Type Ia supernovas.
Researchers using multiple NASA space observatories have been studying an object known as an ultraluminous X-ray source in the neighboring Andromeda galaxy.
A peculiar cosmic explosion seen by the Swift observatory on Christmas Day 2010 was either a novel type of supernova located billions of light-years away or an unusual collision much closer to home
As asteroid 2005 YU55 swept past Earth in the early morning hours of Wednesday, Nov. 9, 2011, Swift monitored the fast-moving space rock.
Two studies in the Aug. 25 issue of Nature provide new insights into a cosmic accident that has been streaming X-rays toward Earth.
Swift discovered a series of powerful X-ray blasts coming from a source in the constellation Draco.