Martian experts have known since 2011 that mysterious, possibly water-related streaks appear and disappear on the planet’s surface. These features were given the descriptive name of recurring slope lineae (RSL) because of their shape, annual reappearance and occurrence generally on steep slopes such as crater walls. A team has been looking closer at this phenomenon to try to understand the nature of these features: water-related or not?
Scientists have thought that the first stars in the universe burst with tremendous energy, spewing out the first heavy elements, such as carbon, iron, and oxygen. But according to new research from Massachusetts Institute of Technology, not all of these first stars may have been forceful exploders.
Texas Advanced Computing Center recently reported the results of several massive numerical simulations charting the forces of the universe in its first hundreds of millions of years. The study, which used some of the world's most powerful supercomputers, has refined our understanding of how the first galaxies formed, and, in particular, how metals in the stellar nurseries influenced the characteristics of the stars in the first galaxies.
The same physics that gives tornadoes their ferocious stability lies at the heart of new Univ. of Washington research, and could lead to a better understanding of nuclear dynamics in studying fission, superconductors and the workings of neutron stars. The work seeks to clarify what Massachusetts Institute of Technology researchers witnessed when in 2013 they named a mysterious phenomenon.
To get an idea of how the early solar system may have formed, scientists often look to asteroids. These relics of rock and dust represent what today’s planets may have been before they differentiated into bodies of core, mantle and crust. In the 1980s, scientists’ view of the solar system’s asteroids was essentially static. But in the last decade, astronomers have detected asteroids with compositions unexpected for their locations in space.
Using the Robert C. Byrd Green Bank Telescope (GBT), astronomer D.J. Pisano from West Virginia Univ. has discovered what could be a never-before-seen river of hydrogen flowing through space. This very faint, very tenuous filament of gas is streaming into the nearby galaxy NGC 6946 and may help explain how certain spiral galaxies keep up their steady pace of star formation.
Space weathering, which works similar to geological erosion on the Earth, produces water in the rims of tiny particles of interplanetary dust. The discovery may have implications on the origins of life and sources of water throughout the galaxy. As a byproduct of star formation, water ice is the most abundant solid material in the universe. But this new source was a surprise.
For decades, astrophysicists have encountered a puzzling contradiction: although many galactic-wind models—simulations of how matter is distributed in our universe—predict that the majority of the "normal" matter exists in stars at the center of galaxies, in actuality these stars account for less than 10% of the matter in the universe. A new set of simulations offer insight into this mismatch between the models and reality.
Several hundred ants have boldly gone where no ants have gone before: the International Space Station (ISS), high above Earth. An unmanned supply rocket delivered 600 small black common pavement ants to the ISS. Their arrival marked the beginning of an experiment designed by a team at Stanford Univ. to determine how the ants, in these exotic surroundings, adapt the innate algorithms that modulate their group behavior.
Astronomers have discovered a distant quasar illuminating a vast nebula of diffuse gas, revealing, for the first time, part of the network of filaments thought to connect galaxies in a cosmic web. Using the 10-m Keck I Telescope at the W. M. Keck Observatory in Hawaii, the researchers detected a very large, luminous nebula of gas extending about 2 million light-years across intergalactic space.
After a 10-year journey and a long, deep sleep the Rosetta space probe will be awoken on Jan. 20, 2014. The vehicle then starts the last leg of its journey which will lead it to the 67P/Churyumov-Gerasimenko comet. Then, mission leaders will attempt a space exploration first: setting the Philae lander down on the comet’s surface in November.
A new study of light from quasars has provided astronomers with illuminating insights into the swirling clouds of gas that form stars and galaxies, proving that the clouds can shift and change much more quickly than previously thought. The team used data from the Sloan Digital Sky Survey, a major eight-year cooperative project to image and map galaxies and quasars.
Dwarf galaxies may be small, but astronomers now know that they can hold massive black holes. Yale Univ. astronomer Marla Geha and collaborators have identified more than 100 dwarf galaxies that show signs of hosting massive black holes, a discovery that challenges the idea that they exist only in much bigger galaxies.
Images released by NASA on Tuesday show galaxies that are 20 times fainter than those pictured before. They are from a new campaign to have the 23-year-old Hubble Space Telescope gaze much earlier and farther away than it was designed to see. The spacecraft is now looking within 500 million years after the Big Bang.
An international team of astronomers, using NASA's Fermi observatory, has made the first-ever gamma ray measurements of a gravitational lens, a kind of natural telescope formed when a rare cosmic alignment allows the gravity of a massive object to bend and amplify light from a more distant source. This accomplishment opens new avenues for research, including a novel way to probe emission regions near supermassive black holes.
A newly discovered system of two white dwarf stars and a superdense pulsar is packed within a space smaller than the Earth’s orbit around the sun. The finding is scientists’ best opportunity yet to discover a violation of a key concept in Albert Einstein’s theory of General Relativity: the strong equivalence principle, which states that the effect of gravity on a body does not depend on the nature or internal structure of that body.
Supernovas are thought to be a primary source of a galaxy’s dust. Direct evidence of a supernova’s dust-making capabilities, however, has been slim and cannot account for the volume of dust detected in young, distant galaxies. Striking new observations with the Atacama Large Millimeter/submillimeter Array (ALMA) telescope capture, for the first time, the remains of a recent supernova brimming with freshly formed dust.
Astronomers are still largely working with a “flat” map of the galaxy, and the European Space Agency hopes to change that with Gaia, its star-surveying satellite which launched into space Thursday. The spacecraft will produce the most accurate 3-D map of the Milky Way yet. Gaia is now heading for a stable orbit on the opposite side of the Earth from the sun, and will always keep its back to the sun.
Astronomers affiliated with the Supernova Legacy Survey (SNLS) have discovered two of the brightest and most distant supernovae ever recorded, 10 billion light-years away and a hundred times more luminous than a normal supernova. These newly discovered supernovae are especially puzzling because the mechanism that powers most of them cannot explain their extreme luminosity.
Noble gas molecules have been detected in space for the first time in the Crab Nebula, a supernova remnant, by astronomers at Univ. College London. Led by Prof. Mike Barlow, the team used ESA's Herschel Space Observatory to observe the Crab Nebula in far infrared light. Their measurements of regions of cold gas and dust led them to the serendipitous discovery of the chemical fingerprint of argon hydride ions.
An atmospheric peculiarity the Earth shares with Jupiter, Saturn, Uranus and Neptune is likely common to billions of planets, Univ. of Washington astronomers have found, and knowing that may help in the search for potentially habitable worlds. The paper uses basic physics to show why this happens, and suggests that tropopauses are probably common to billions of thick-atmosphere planets and moons throughout the galaxy.
Jupiter’s moon Europa features an intricate network of cracks in its icy surface. This unusual pattern is particularly pronounced around the equator. Scientists performing modeling studies on the potential marine currents below this ice layer have discovered that, near Europa’s equator, warmer water rises from deep within the moon.
A massive impact on the moon about 4 billion years ago left a 2,500-mile crater, among the largest known craters in the solar system. Smaller subsequent impacts left craters within that crater. Comparing the spectra of light reflected from the peaks of those craters may yield clues to the composition of the moon’s lower crust and mantle—and would have implications for models of how the moon formed.
NASA's Curiosity rover has uncovered signs of an ancient freshwater lake on Mars that may have teemed with tiny organisms for tens of millions of years, far longer than scientists had imagined, new research suggests. The watering hole near the Martian equator existed about 3.5 billion years ago. Scientists say it was neither salty nor acidic, and contained nutrients—a perfect spot to support microbes.
A research team has discovered a natural particle accelerator of interstellar scale. By analyzing data from NASA’s Van Allen probes, physicists have been able to measure and identify the “smoking gun” of a planetary scale process that accelerates particles to speeds close to the speed of light within the Van Allen radiation belt.