Quintessence and phantom fields, two hypotheses formulated using data from satellites, such as Planck and WMAP, are among the many theories that try to explain the nature of dark energy. Now researchers suggest that both possibilities are only a mirage in the observations and it is the quantum vacuum which could be behind this energy that moves our universe.
A rocket launch in March 2004, multiple swing-bys past Earth and Mars, high-speed fly-bys of asteroids Steins and Lutetia - after all this, the Philae lander on board ESA's Rosetta spacecraft, which is en route to Comet 67P/Churyumov-Gerasimenko, is in good shape.
Researcher have intently studied the closest type Ia supernova discovered in a generation. The proximity to Earth could yield better understanding of this particular type of supernova that astronomers use to gauge distances in the universe and learn about its expansion history.
F-type stars, more massive and hotter than our sun, warrant more consideration as spots to look for habitable planets, according to a newly published study that also examined potential damage to DNA from UV radiation.
Recently physicists have been poking holes again in Stephen Hawking's black hole theory - including Hawking himself. Now professor Chris Adami, Michigan State University, has jumped into the fray. He believes he has solved the decades-old information paradox debate in a groundbreaking new study.
Scientists used a simulation model that is far more accurate than previously used, and carried out an experiment to test a hypothesis about the behaviour of hydrogen that is splitting the scientific community.
Using radar measurements gathered by NASA's Cassini spacecraft, geophysicists have concluded that the surface of Ligeia Mare, Titan's second largest sea, has a mirror-like smoothness, possibly due to a lack of winds. As the only other solar system body with an Earth-like weather system, Titan could serve as a model for studying our own planet's early history.
Scientists have discovered a new, persistent structure in Earth's inner radiation belt using data from the twin NASA Van Allen Probes spacecraft. Most surprisingly, this structure is produced by the slow rotation of Earth, previously considered incapable of affecting the motion of radiation belt particles, which have velocities approaching the speed of light.
Researchers have detected water vapor in the atmosphere of a planet outside our solar system. The team applied a sophisticated Doppler technique to the infrared to directly detect the planet and demonstrate the presence of water in its atmosphere.
On July 23, 2012, a huge magnetic storm propelled by two nearly simultaneous coronal mass ejections on the sun plowed through Earth's orbit. Luckily, Earth was on the other side of the sun at the time. Had the outburst hit Earth, however, it would have rivaled the largest magnetic storm to strike Earth in recorded history, possibly wreaking havoc with the electrical grid, satellites and GPS.