A team of scientists has created an "MRI" of the sun's interior plasma motions, shedding light on how it transfers heat from its deep interior to its surface. The result upends our understanding of how heat is transported outwards by the sun and challenges existing explanations of the formation of sunspots and magnetic field generation.
In a bold plan unveiled Thursday, a group of ex-NASA astronauts and scientists wants to launch its own space telescope to spot and track small and mid-sized space rocks capable of wiping out a city or continent. They contend that while astronomers routinely look for planet killers like the one that may have wiped out the dinosaurs, not enough attention is paid to smaller objects.
About 800 extra-solar planets have been discovered so far in our galaxy, but the precise masses of the majority of them are still unknown. The only previous way to determine mass was to observe a transit, during which the planet’s host is eclipsed. Now, scientist Mercedes López-Morales has, for the first time, determined the mass of a non-transiting planet.
Turbulent jet streams, regions where winds blow faster than in other places, churn east and west across Saturn. Scientists have been trying to understand for years the mechanism that drives these wavy structures in Saturn's atmosphere. Recent images from NASA’s Cassini spacecraft has revealed the source from which the jets derive their energy.
Finding new particles usually requires high energies—that is why huge accelerators have been built, which can accelerate particles to almost the speed of light. But there are other creative ways of finding new particles: At the Vienna University of Technology, scientists presented a method to prove the existence of hypothetical "axions."
Building a terrestrial planet requires raw materials that weren't available in the early history of the universe. The Big Bang filled space with hydrogen and helium. Chemical elements like silicon and oxygen had to be cooked up over time by stars. But how long did that take? How many of such heavy elements do you need to form planets?
Scheduled for launch this week from Kwajalein Atoll in the Marshall Islands, the Nuclear Spectroscopic Telescope Array (or NuSTAR), is the first focusing, high energy X-ray satellite to be launched from NASA. Hundreds of times more sensitive than any previous hard X-ray instrument, it will allow researchers to take a census of black holes.
During a powerful solar blast on March 7, the Fermi Gamma-ray Space Telescope detected the highest-energy light ever associated with an eruption on the sun. The flare produced such an outpouring of gamma rays—a form of light with even greater energy than X-rays—that the sun briefly became the brightest object in the gamma-ray sky.
Astronomers in a NASA news conference Thursday said that years of observations from the Hubble Space Telescope provide grisly details of a long-anticipated galactic smashup, one that will involve the dead-on crash of a neighboring galaxy with our entire Milky Way.
In a new study, researchers from the Georgia Institute of Technology used experiments and numerical calculations to show that iron, in the absence of oxygen, can substitute for magnesium in RNA binding, folding, and catalysis. The researchers found that RNA's shape and folding structure remained the same and its functional activity increased when magnesium was replaced by iron in an oxygen-free environment.
On Wednesday, the Large Underground Xenon experiment, or LUX, became official when part of the closed Homestake Gold Mine nearly 5,000 feet beneath the earth at Lead, S.D., opened for business, not as a mine, but as an underground campus. The primary curriculum: finding out where dark matter is.
South Africa and Australia had competed fiercely against each other for the Square Kilometer Array telescope project, which will become the world’s biggest instrument when built. Recently, the consortium overseeing the effort decided to award it to both countries, with South Africa getting the lion’s share of the radio dishes.
More than 2 billion years ago, a much fainter sun should have left the Earth as an orbiting ice ball, unfit to develop life as we know it today. Why the Earth avoided the deep freeze is a question that has puzzled scientists, but Purdue University's David Minton believes he might have an answer.
Dark matter accounts for at least 80% of the matter in the universe. No one knows what it is, but most scientists would bet on weakly interacting massive particles, or WIMPs. LUX, the Large Underground Xenon detector at the Sanford Underground Research Facility nearly a mile below the Black Hills of South Dakota, holds 350 kg of liquid xenon and is a trap set for dark-matter WIMPs.
In a new study, researchers describe what they found in data from Cassini: a new class of space particles—submicroscopic nanograins of electrically charged dust. Such particles are believed to exist throughout the universe, and this marks the first time researchers have measured and analyzed them.
Researchers at Massachusetts Institute of Technology, NASA, and elsewhere have detected a possible planet, some 1,500 light years away, that appears to be evaporating under the blistering heat of its parent star. The scientists infer that a long tail of debris is following the planet, and that this tail may tell the story of the planet's disintegration.
By combining the light of three powerful infrared telescopes, an international research team has observed the active accretion phase of a supermassive black hole in the center of a galaxy tens of millions of light years away, a method that has yielded an unprecedented amount of data for such observations.
A team of astronomers has found that the most active galactic nuclei—enormous black holes that are violently devouring gas and dust at the centers of galaxies—may prevent new stars from forming.
Most people take gravity for granted. But for University of Pennsylvania astrophysicist Bhuvnesh Jain, the nature of gravity is the question of a lifetime. As scientists have been able to see farther and deeper into the universe, the laws of gravity have been revealed to be under the influence of an unexplained force. By analyzing a well-studied class of stars in nearby galaxies, a team of astrophysicists have produced new findings that narrow down the possibilities of what this force could be.
Scientists on a planetary-heat-seeking mission have detected the first infrared light from a super-Earth—in this case, a planet some 40 light-years away. And according to their calculations, 55 Cancri e, a planet just over twice the size of Earth, is throwing off some serious heat.
NASA's Hubble Space Telescope recently imaged the Moon’s crater Tycho, though not for the purpose of adding to our knowledge of the lunar surface. Instead, the telescope was being prepped for study the last transit of the sun by Venus to occur this century. Because the Hubble can’t look at the sun directly, the Moon will serve as a giant mirror.
Type Ia supernovae are important stellar phenomena, used to measure the expansion of the universe. But astronomers know embarrassingly little about the stars they come from and how the explosions happen. New research from a team led by Harvard University examined 23 Type Ia supernovae and helped identify the formation process for at least some of them.
A group of scientists took to the skies in a slow-moving airship Thursday in search of meteorites that rained over California's gold country last month. It's the latest hunt for extraterrestrial fragments from the April 22 explosion that was witnessed over a swath of Northern California and Nevada.
Our solar system is four and a half billion years old, but its formation may have occurred over a shorter period of time than we previously thought, says an international team of researchers from the Hebrew University of Jerusalem and universities and laboratories in the U.S. and Japan.
Using the world's largest radio telescope, scientists at Arecibo, Puerto Rico, have discovered flaring radio emissions from an ultra-cool star, not much warmer than the planet Jupiter, shattering the previous record for the lowest stellar temperature at which radio waves were detected.