Astronomers have uncovered the strange case of a neutron star with the peculiar ability to transform from a radio pulsar into an X-ray pulsar and back again. This star's capricious behavior appears to be fueled by a nearby companion star and may give new insights into the birth of millisecond pulsars.
In the already complicated science of what creates -- and causes constant change in -- two giant doughnuts of radiation surrounding Earth, researchers have added a new piece of information: Some of the electrons reach such enormous energies that they are driven by an entirely different set of physical processes.
The densest galaxy in the nearby Universe may have been found. Packed with an extraordinary number of stars, this unusual galaxy is providing astronomers with clues to its intriguing past and how it fits into the galactic evolutionary chain.
More than 83,000 volunteer citizen scientists. Over 16 million galaxy classifications. Information on more than 300,000 galaxies. This is what you get when you ask the public for help in learning more about our universe.
Two million years ago a supermassive black hole at the heart of our galaxy erupted in an explosion so immensely powerful that it lit up a cloud 200,000 light years away, a team of researchers led by the University of Sydney has revealed.
Responding to a space exploration roadmap recently released by NASA and the International Space Exploration Coordination Group that calls for robotic and human missions to near-Earth asteroids, the Moon and Mars, Srilanth Saripalli argues that most of the arguments in favor of manned space exploration are based on near-sighted assumptions about emerging developments in robotics.
Since the discovery of the Van Allen radiation belts, scientists believed these belts consisted of two rings of highly charged particles. In February, scientists reported the discovery of a previously unknown third radiation ring - a narrow ring that briefly circled the Earth for a month. UCLA space scientists have successfully modeled and explained the unprecedented behavior of this third ring, and show that its energetic particles are driven by very different physics than the others.
Since 2000, the four identical satellites of the Cluster quartet have been probing Earth's magnetosphere in three dimensions. This week, two of them made their closest-ever approach, just 4 km, enabling valuable data to be acquired with unprecedented detail.
Data from NASA's Curiosity rover has revealed the Martian environment lacks methane. This is a surprise to researchers because previous data reported by U.S. and international scientists indicated positive detections.
A team of astronomers has discovered enormous arms of hot gas in the Coma cluster of galaxies by using NASA's Chandra X-ray Observatory and ESA's XMM-Newton. These features, which span at least half a million light years, provide insight into how the Coma cluster has grown through mergers of smaller groups and clusters of galaxies to become one of the largest structures in the universe held together by gravity.
Researchers at EU-funded project AEROFAST ('Aerocapture for future space transportation') have successfully simulated a flight manoeuvre in which a space vehicle uses a planet's atmosphere to slow itself down.