ESA Science & Technology
22 Aug 2017, 10:00 UTC
As the energetic particles of the solar wind speed across interplanetary space, their motion is modified by objects in their path. A study, based on data from ESA's Mars Express orbiter, has thrown new light on a surprising interaction between the planet Mars and supersonic particles in the solar wind.
The moving Martian bow shock
22 Aug 2017, 10:00 UTC
As the energetic particles of the solar wind speed across interplanetary space, their motion is modified by objects in their path. A study, based on data from ESA's Mars Express orbiter, has thrown new light on a surprising interaction between the planet Mars and supersonic particles in the solar wind.
The University of Arizona Astronomy News
17 Aug 2017, 20:48 UTC
For the first time, astronomers have seen atmospheric bands and waves, reminiscent of those seen in familiar gas giants like Neptune, in brown dwarfs, strange worlds that are not quite planets and not quite stars.
Scientists Solve Mystery of Blinking Brown Dwarfs
17 Aug 2017, 20:48 UTC
For the first time, astronomers have seen atmospheric bands and waves, reminiscent of those seen in familiar gas giants like Neptune, in brown dwarfs, strange worlds that are not quite planets and not quite stars.
NASA's Jet Propulsion Laboratory News and Features
17 Aug 2017, 19:08 UTC
An Insider's Guide to Voyager: 1977-2017
17 Aug 2017, 19:08 UTC
NASA's Jet Propulsion Laboratory News and Features
17 Aug 2017, 19:08 UTC
Large Asteroid to Safely Pass Earth on Sept. 1
17 Aug 2017, 19:08 UTC
NASA's Spitzer Space Telescope
17 Aug 2017, 00:00 UTC
Scientists Improve Brown Dwarf Weather Forecasts
17 Aug 2017, 00:00 UTC
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Blogs
Lights in the Dark
22 Aug 2017, 02:29 UTC
Photo from the August 21, 2017 total solar eclipse. © Jason Major Today, August 21, 2017, the Moon briefly slid in front of the Sun, casting its shadow onto the Earth–the deepest part of which (called the umbra) passing across the United States from Salem, Oregon to Charleston, South Carolina. I arranged to be positioned at the latter location, and thus experienced for the first time solar eclipse totality from 2:46 to 2:47 and a half p.m. this afternoon. It was, as they say, a mind-blowing experience…if just in the sheer sense of seeing something entirely different happening to the usually very typical Sun in the middle of what would otherwise be a very typical day. (Except that it was neither of those.) Below are some of my photos from the event. I captured photos with a Nikon D810 and Sigma 150-600 lens affixed to a tripod. I used a Daystar white light filter for the partial phase, but removed it as totality approached and shot to try to capture solar prominences and the effect known as “Baily’s Beads”, which are the last bits of sunlight shining through low valleys between mountains along the limb of the Moon. Thankfully I ...
Black Hole Sun: Photos of a Total Solar Eclipse
22 Aug 2017, 02:29 UTC
Photo from the August 21, 2017 total solar eclipse. © Jason Major Today, August 21, 2017, the Moon briefly slid in front of the Sun, casting its shadow onto the Earth–the deepest part of which (called the umbra) passing across the United States from Salem, Oregon to Charleston, South Carolina. I arranged to be positioned at the latter location, and thus experienced for the first time solar eclipse totality from 2:46 to 2:47 and a half p.m. this afternoon. It was, as they say, a mind-blowing experience…if just in the sheer sense of seeing something entirely different happening to the usually very typical Sun in the middle of what would otherwise be a very typical day. (Except that it was neither of those.) Below are some of my photos from the event. I captured photos with a Nikon D810 and Sigma 150-600 lens affixed to a tripod. I used a Daystar white light filter for the partial phase, but removed it as totality approached and shot to try to capture solar prominences and the effect known as “Baily’s Beads”, which are the last bits of sunlight shining through low valleys between mountains along the limb of the Moon. Thankfully I ...
Universe Today
21 Aug 2017, 22:17 UTC
For decades, scientists have tried to crack the mystery of Mars’ weather patterns. While the planet’s atmosphere is much thinner than our own – with less than 1% of the air pressure that exists on Earth at sea level – clouds have been seen periodically in the skies above the surface. In addition, periodic snowfalls has been spotted over the years, mainly in the form of carbon dioxide snow (i.e. dry ice). However, according to a new study by a team of French and American astronomers, Mars experiences snowfalls in the form of water-ice particles. These snowfalls occur only at night, coinciding with drops in global temperature. The presence of these storms, and the speed at which they reach the surface, is forcing scientists to rethink Mars’ weather patterns. The study, titled “Snow Precipitation on Mars Driven by Cloud-Induced Night-Time Convection“, recently appeared in the journal Nature Geosciences. Led by Aymeric Spiga, a tenured lecturer at the Université Pierre et Marie Curie and a researcher at Laboratoire de Météorologie Dynamique in Paris, the team conducted numerical simulations of Mars’ cloudy regions to demonstrate that localized convective snowstorms can occur there. Mars’ north polar ice cap, captured by NASA’s Mars Global ...
New Study Says that Martian Weather May Get Snowy Overnight
21 Aug 2017, 22:17 UTC
For decades, scientists have tried to crack the mystery of Mars’ weather patterns. While the planet’s atmosphere is much thinner than our own – with less than 1% of the air pressure that exists on Earth at sea level – clouds have been seen periodically in the skies above the surface. In addition, periodic snowfalls has been spotted over the years, mainly in the form of carbon dioxide snow (i.e. dry ice). However, according to a new study by a team of French and American astronomers, Mars experiences snowfalls in the form of water-ice particles. These snowfalls occur only at night, coinciding with drops in global temperature. The presence of these storms, and the speed at which they reach the surface, is forcing scientists to rethink Mars’ weather patterns. The study, titled “Snow Precipitation on Mars Driven by Cloud-Induced Night-Time Convection“, recently appeared in the journal Nature Geosciences. Led by Aymeric Spiga, a tenured lecturer at the Université Pierre et Marie Curie and a researcher at Laboratoire de Météorologie Dynamique in Paris, the team conducted numerical simulations of Mars’ cloudy regions to demonstrate that localized convective snowstorms can occur there. Mars’ north polar ice cap, captured by NASA’s Mars Global ...
Starts With A Bang!
21 Aug 2017, 14:00 UTC
“A candidate is not going to suddenly change once they get into office. Just the opposite, in fact. Because the minute that individual takes that oath, they are under the hottest, harshest light there is. And there is no way to hide who they really are.” -Michelle Obama The most massive stars in the Universe are true behemoths, rising to hundreds of times the mass of our Sun and burning at temperatures upwards of 30,000 K at their surface. But there are stars out there that are even hotter, despite only being 10% or less as massive: Wolf-Rayet stars. The key to their cosmic success? Blowing off their outer layers of hydrogen. O-class stars are the hottest main-sequence stars, but by expelling their outer hydrogen layers, as this illustration shows, they can achieve even greater temperatures. The star illustrated here is the first Wolf-Rayet star to be found with a disk. Image credit: NASA, ESA, and G. Bacon (STScI); Science Credit: NASA, ESA, and J. Mauerhan. By only leaving the dense, massive core of already-fused elements, Wolf-Rayet stars burn helium, carbon, oxygen or even heavier elements at their centers, while the journey to the surface “only” cools the star down ...
The Hottest Stars In The Universe Are All Missing One Key Ingredient (Synopsis)
21 Aug 2017, 14:00 UTC
“A candidate is not going to suddenly change once they get into office. Just the opposite, in fact. Because the minute that individual takes that oath, they are under the hottest, harshest light there is. And there is no way to hide who they really are.” -Michelle Obama The most massive stars in the Universe are true behemoths, rising to hundreds of times the mass of our Sun and burning at temperatures upwards of 30,000 K at their surface. But there are stars out there that are even hotter, despite only being 10% or less as massive: Wolf-Rayet stars. The key to their cosmic success? Blowing off their outer layers of hydrogen. O-class stars are the hottest main-sequence stars, but by expelling their outer hydrogen layers, as this illustration shows, they can achieve even greater temperatures. The star illustrated here is the first Wolf-Rayet star to be found with a disk. Image credit: NASA, ESA, and G. Bacon (STScI); Science Credit: NASA, ESA, and J. Mauerhan. By only leaving the dense, massive core of already-fused elements, Wolf-Rayet stars burn helium, carbon, oxygen or even heavier elements at their centers, while the journey to the surface “only” cools the star down ...
David Reneke's World of Space and Astronomy
21 Aug 2017, 00:00 UTC
Measuring a Black Hole is as Simple as ABC
21 Aug 2017, 00:00 UTC
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