Voyager 1 appears to have at long last left our solar system and entered interstellar space, says a University of Maryland-led team of researchers
Carrying Earthly greetings on a gold plated phonograph record and still-operational scientific instruments — including the Low Energy Charged Particle detector designed, built and overseen, in part, by UMD’s Space Physics Group — NASA’s Voyager 1 has traveled farther from Earth than any other human-made object. And now, these researchers say, it has begun the first exploration of our galaxy beyond the Sun’s influence.
“It’s a somewhat controversial view, but we think Voyager has finally left the Solar System, and is truly beginning its travels through the Milky Way,” says UMD research scientist Marc Swisdak, lead author of a new paper published online this week in The Astrophysical Journal Letters. Swisdak and fellow plasma physicists James F. Drake, also of the University of Maryland, and Merav Opher of Boston University have constructed a model of the outer edge of the Solar System that fits recent observations, both expected and unexpected.
Read more: http://www.sciencedaily.com/releases/2013/08/130815133726.htm
These red, orange and green clouds (false color) in Saturn’s northern hemisphere indicate the tail end of a massive storm that started in December 2010. Even after visible signs of the storm started to fade, infrared measurements continued to reveal powerful effects at work in Saturn’s stratosphere. Image credit:NASA/JPL-Caltech/Space Science Institute
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October 25, 2012
PASADENA, Calif. — NASA’s Cassini spacecraft has tracked the aftermath of a rare massive storm on Saturn. Data reveal record-setting disturbances in the planet’s upper atmosphere long after the visible signs of the storm abated, in addition to an indication the storm was more forceful than scientists previously thought.
Data from Cassini’s composite infrared spectrometer (CIRS) instrument revealed the storm’s powerful discharge sent the temperature in Saturn’s stratosphere soaring 150 degrees Fahrenheit (83 kelvins) above normal. At the same time, researchers at NASA’s Goddard Spaceflight Center in Greenbelt, Md., detected a huge increase in the amount of ethylene gas, the origin of which is a mystery. Ethylene, an odorless, colorless gas, isn’t typically observed on Saturn. On Earth, it is created by natural and man-made sources.
Goddard scientists describe the unprecedented belch of energy in a paper to be published in the Nov. 20 issue of the Astrophysical Journal.
“This temperature spike is so extreme it’s almost unbelievable, especially in this part of Saturn’s atmosphere, which typically is very stable,” said Brigette Hesman, the study’s lead author and a University of Maryland scientist who works at Goddard. “To get a temperature change of the same scale on Earth, you’d be going from the depths of winter in Fairbanks, Alaska, to the height of summer in the Mojave Desert.”
Read more: http://www.jpl.nasa.gov/news/news.php?release=2012-335&rn=news.xml&rst=3564
ScienceDaily (Aug. 29, 2012) — Posing for portraits for NASA’s Cassini spacecraft, Saturn and its largest moon, Titan, show spectacular colors in a quartet of images being released today. One image captures the changing hues of Saturn’s northern and southern hemispheres as they pass from one season to the next.
A wide-angle view in today’s package captures Titan passing in front of Saturn, as well as the planet’s changing colors. Upon Cassini’s arrival at Saturn eight years ago, Saturn’s northern winter hemisphere was an azure blue. Now that winter is encroaching on the planet’s southern hemisphere and summer on the north, the color scheme is reversing: blue is tinting the southern atmosphere and is fading from the north.
The other three images depict the newly discovered south polar vortex in the atmosphere of Titan, reported recently by Cassini scientists. Cassini’s visible-light cameras have seen a concentration of yellowish haze in the detached haze layer at the south pole of Titan since at least March 27. Cassini’s visual and infrared mapping spectrometer spotted the massing of clouds around the south pole as early as May 22 in infrared wavelengths. After a June 27 flyby of the moon, Cassini released a dramatic image and movie showing the vortex rotating faster than the moon’s rotation period. The four images being released today were acquired in May, June and July of 2012.
By Jonathan Amos Science correspondent
The MRO image shows the terrain around the rover (double blue/white dot) at its landing site within Gale Crater on Mars. The blue fans either side are rocket blast marks in the ground
Nasa has used its high-resolution imaging satellite at the Red Planet to look down on the Curiosity rover and acquire a new picture of the recently landed six-wheeled robot.
The vehicle appears as a double dot.
The view from the Mars Reconnaissance Orbiter (MRO) has been colour enhanced to emphasise certain ground features.
These include the disturbance in the soil made either side of the vehicle by the rocket powered crane that lowered Curiosity into Gale Crater a week ago.
“We can clearly see Curiosity – it’s like two bright spots that we see, and their shadows. And then it’s surrounded by the blast pattern from the descent stage – those little blue fans right next to it (false colour blue),” explained Alfred McEwen, the principal investigator on MRO’s High Resolution Image Science Experiment (HiRise) camera.
Read more: http://www.bbc.co.uk/news/science-environment-19262486
ScienceDaily (Aug. 9, 2012) — For years, many scientists had thought that plate tectonics existed nowhere in our solar system but on Earth. Now, a UCLA scientist has discovered that the geological phenomenon, which involves the movement of huge crustal plates beneath a planet’s surface, also exists on Mars.
“Mars is at a primitive stage of plate tectonics. It gives us a glimpse of how the early Earth may have looked and may help us understand how plate tectonics began on Earth,” said An Yin, a UCLA professor of Earth and space sciences and the sole author of the new research.
Yin made the discovery during his analysis of satellite images from a NASA spacecraft known as THEMIS (Time History of Events and Macroscale Interactions during Substorms) and from the HIRISE (High Resolution Imaging Science Experiment) camera on NASA’s Mars Reconnaissance Orbiter. He analyzed about 100 satellite images — approximately a dozen were revealing of plate tectonics.
Read more: http://www.sciencedaily.com/releases/2012/08/120809155831.htm
Image credit: ESA/NASA
This image snapped by the NASA/ESA Hubble Space Telescope reveals an exquisitely detailed view of part of the disc of the spiral galaxy NGC 4565. This bright galaxy is one of the most famous examples of an edge-on spiral galaxy, oriented perpendicularly to our line of sight so that we see right into its luminous disc. NGC 4565 has been nicknamed the Needle Galaxy because, when seen in full, it appears as a very narrow streak of light on the sky.
The edgewise view into the Needle Galaxy shown here looks very similar to the view we have from our Solar System into the core of the Milky Way. In both cases ribbons of dust block some of the light coming from the galactic disc. To the lower right, the dust stands in even starker contrast against the copious yellow light from the star-filled central regions. NGC 4565’s core is off camera to the lower right.
Wednesday, 11 July 2012
‘Huge glaciers in the area between Pakistan and China are puzzling scientists – and disproving the doom-laden predictions of some climate experts. The glaciers in the Karakoram Range between northern Pakistan and western China have actually grown, rather than shrinking.
Unlike most mountain glaciers, the Karakoram glaciers, which account for 3 percent of the total ice-covered area in the world, excluding Greenland and Antarctica, are not shrinking.’