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Astronomy (General/Chat)

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  • Astronomy Picture of the Day -- The ISS and a Colorful Moon

    07/31/2015 4:18:26 AM PDT · by SunkenCiv · 2 replies
    NASA ^ | July 31, 2015 | (see photo credit)
    Explanation: Tonight's Full Moon, the second Full Moon in July, could be called a blue moon according to modern folklore. But this sharp and detailed mosaic, recorded with telescope and digital camera just before July's first Full Moon, actually does show a colorful lunar surface. The colors have been enhanced in the processed image but are real nonetheless, corresponding to real differences in the chemical makeup of the lunar surface. Also easy to see especially when the Moon is near full phase, bright rays from 85 kilometer wide Tycho crater at the upper right extend far across the lunar surface....
  • Anyone noticed that the moon is brighter than normal tonight ?

    07/30/2015 7:36:30 PM PDT · by American Constitutionalist · 87 replies
    none | 7/30/2015 | self American Constitutionalist
    Has anyone noticed that the moon is brighter than normal tonight ? Saw a bright object flying in the sky brighter than airplane in eastern USA.
  • Astronomy Picture of the Day -- Milky Way over Uluru

    07/30/2015 1:16:33 AM PDT · by SunkenCiv · 6 replies
    NASA ^ | July 30, 2015 | (see photo credit)
    Explanation: The central regions of our Milky Way Galaxy rise above Uluru/Ayers Rock in this striking night skyscape. Recorded on July 13, a faint airglow along the horizon shows off central Australia's most recognizable landform in silhouette. Of course the Milky Way's own cosmic dust clouds appear in silhouette too, dark rifts along the galaxy's faint congeries of stars. Above the central bulge, rivers of cosmic dust converge on a bright yellowish supergiant star Antares. Left of Antares, wandering Saturn shines in the night.
  • What Are These Strange Scarlet Streaks Spotted on Tethys?

    07/29/2015 11:40:55 AM PDT · by BenLurkin · 26 replies
    universetoday.com ^ | July 29, 2015 | Jason Major
    They stretch for long distances across the moon’s surface following the rugged terrain, continuing unbroken over hills and down into craters… and their cause isn’t yet known. According to a NASA news release, “The origin of the features and their reddish color is currently a mystery to Cassini scientists. Possibilities being studied include ideas that the reddish material is exposed ice with chemical impurities, or the result of outgassing from inside Tethys. The streaks could also be associated with features like fractures that are below the resolution of the available images.” The images were taken by Cassini during a flyby...
  • No, German Scientists Have Not Confirmed the “Impossible” EMDrive

    07/29/2015 10:27:45 AM PDT · by Red Badger · 35 replies
    io9.com ^ | 7/28/15 10:40am | George Dvorsky
    Two German researchers claim they have produced measurable amounts of thrust using a copy of NASA’s controversial EMDrive. It’s a result that has many people talking, but don’t plan your trip to the to the Alpha Centauri system just yet—the experts we spoke with are all highly skeptical of the study and its findings. As reported in Hacked, the details of the new study are being presented this week by Martin Tajmar, a professor and chair for Space Systems at the Dresden University of Technology, and co-author G. Fiedler, at the American Institute for Aeronautics and Astronautics’ Propulsion and Energy...
  • Astronomy Picture of the Day -- The Deep Lagoon

    07/29/2015 4:09:07 AM PDT · by SunkenCiv · 5 replies
    NASA ^ | July 29, 2015 | (see photo credit)
    Explanation: Ridges of glowing interstellar gas and dark dust clouds inhabit the turbulent, cosmic depths of the Lagoon Nebula. Also known as M8, The bright star forming region is about 5,000 light-years distant. But it still makes for a popular stop on telescopic tours of the constellation Sagittarius, toward the center of our Milky Way Galaxy. Dominated by the telltale red emission of ionized hydrogen atoms recombining with stripped electrons, this stunning, deep view of the Lagoon's central reaches is about 40 light-years across. Near the center of the frame, the bright hourglass shape is gas ionized and sculpted by...
  • Astronomy Picture of the Day -- Rainbows and Rays over Bryce Canyon

    07/28/2015 5:55:29 PM PDT · by SunkenCiv · 6 replies
    NASA ^ | July 28, 2015 | (see photo credit)
    Explanation: What's happening over Bryce Canyon? Two different optical effects that were captured in one image taken earlier this month. Both effects needed to have the Sun situated directly behind the photographer. The nearest apparition was the common rainbow, created by sunlight streaming from the setting sun over the head of the photographer, and scattering from raindrops in front of the canyon. If you look closely, even a second rainbow appears above the first. More rare, and perhaps more striking, are the rays of light that emanate out from the horizon above the canyon. These are known as anticrepuscular rays...
  • Eris’ Moon of Dysnomia

    07/28/2015 1:50:21 PM PDT · by BenLurkin · 8 replies
    Ask a person what Dysnomia refers to... But in addition to being a condition that affects the memory (where people have a hard time remembering words and names), it is also the only known moon of the distant dwarf planet Eris. In fact, the same team that discovered Eris a decade ago – a discovery that threw our entire notion of what constitutes a planet into question – also discovered a moon circling it shortly thereafter. ... The actual size of Dysnomia is subject to dispute, and estimates are based largely on the planet’s albedo relative to Eris. For example,...
  • Neptune’s Moon of Triton

    07/28/2015 11:52:43 AM PDT · by BenLurkin · 7 replies
    universetoday.com ^ | July 28, 2015 | Fraser Cain
    The planets of the outer Solar System are known for being strange, as are their many moons. This is especially true of Triton, Neptune’s largest moon. In addition to being the seventh-largest moon in the Solar System, it is also the only major moon that has a retrograde orbit – i.e. it revolves in the direction opposite to the planet’s rotation. This suggests that Triton did not form in orbit around Neptune, but is a cosmic visitor that passed by one day and decided to stay. ... Triton has a radius, density (2.061 g/cm3), temperature and chemical composition similar to...
  • 'Impossible' rocket drive works and could get to Moon in four hours

    07/28/2015 11:20:36 AM PDT · by Mellonkronos · 70 replies
    The Telegraph ^ | July 28, 2015 | Sarah Knapton
    [Now this would be really cool! Hope it pans out!] 'Impossible' rocket drive works and could get to Moon in four hoursThe British designed EM Drive actually works and would dramatically speed up space travel, scientists have confirmedBy Sarah Knapton, Science Editor 6:04PM BST 28 Jul 2015 Interplanetary travel could be a step closer after scientists confirmed that an electromagnetic propulsion drive, which is fast enough to get to the Moon in four hours, actually works. The EM Drive was developed by the British inventor Roger Shawyer nearly 15 years ago but was ridiculed at the time as being scientifically...
  • Ceres Resembles Saturn’s Icy Moons

    07/28/2015 11:14:36 AM PDT · by BenLurkin · 4 replies
    universetoday.com ^ | on July 28, 2015 | Jason Major
    Ceres’ topography is revealed in full (but false) color in a new map created from elevation data gathered by NASA’s Dawn spacecraft, now nearly five months in orbit around the dwarf planet orbiting the Sun within the main asteroid belt. With craters 3.7 miles (6 km) deep and mountains rising about the same distance from its surface, Ceres bears a resemblance to some of Saturn’s frozen moons. “The craters we find on Ceres, in terms of their depth and diameter, are very similar to what we see on Dione and Tethys, two icy satellites of Saturn that are about the...
  • Next Blue Moon is July 31

    07/27/2015 1:02:14 PM PDT · by GoneSalt · 11 replies
    earthsky.org ^ | 7/27/2015 | earthsky.org Staff
    The moon was full on July 2, and it’ll be full again on July 31. The second of two full moons in a calendar month is often called a Blue Moon. _________________________ The next Blue Moon is July 31, 2015. In recent decades, many people have begun using the name Blue Moon to describe the second full moon of a calendar month. There was a full moon on July 2, 2015. There’s another full moon on July 31. So the July 31 full moon will be called a Blue Moon, according to this definition. The time between one full moon...
  • Astronomy Picture of the Day - Milky Way and Aurora over Antarctica

    07/26/2015 9:41:25 PM PDT · by SunkenCiv · 19 replies
    NASA ^ | July 27, 2015 | Image Credit & Copyright: LI Hang
    Explanation: It has been one of the better skies of this long night. In parts of Antarctica, not only is it winter, but the Sun can spend weeks below the horizon. At China's Zhongshan Station, people sometimes venture out into the cold to photograph a spectacular night sky. The featured image from one such outing was taken in mid-July, just before the end of this polar night. Pointing up, the wide angle lens captured not only the ground at the bottom, but at the top as well. In the foreground is a colleague also taking pictures. In the distance, a...
  • Astronomy Picture of the Day -- The Sombrero Galaxy from Hubble

    07/26/2015 8:36:07 AM PDT · by SunkenCiv · 18 replies
    NASA ^ | July 26, 2015 | (see photo credit)
    Explanation: Why does the Sombrero Galaxy look like a hat? Reasons include the Sombrero's unusually large and extended central bulge of stars, and dark prominent dust lanes that appear in a disk that we see nearly edge-on. Billions of old stars cause the diffuse glow of the extended central bulge. Close inspection of the bulge in the above photograph shows many points of light that are actually globular clusters. M104's spectacular dust rings harbor many younger and brighter stars, and show intricate details astronomers don't yet fully understand. The very center of the Sombrero glows across the electromagnetic spectrum, and...
  • Astronomy Picture of the Day -- Infrared Trifid

    07/25/2015 1:58:13 PM PDT · by SunkenCiv · 7 replies
    NASA ^ | July 25, 2015 | (see photo credit)
    Explanation: The Trifid Nebula, also known as Messier 20, is easy to find with a small telescope, a well known stop in the nebula rich constellation Sagittarius. But where visible light pictures show the nebula divided into three parts by dark, obscuring dust lanes, this penetrating infrared image reveals filaments of glowing dust clouds and newborn stars. The spectacular false-color view is courtesy of the Spitzer Space Telescope. Astronomers have used the Spitzer infrared image data to count newborn and embryonic stars which otherwise can lie hidden in the natal dust and gas clouds of this intriguing stellar nursery. As...
  • Global Mosaic of Pluto in True Color (highest resolution full-face photo released to date)

    07/25/2015 9:33:45 AM PDT · by LibWhacker · 35 replies
    NASA ^ | 7/24/15
    Four images from New Horizons’ Long Range Reconnaissance Imager (LORRI) were combined with color data from the Ralph instrument to create this sharper global view of Pluto. (The lower right edge of Pluto in this view currently lacks high-resolution color coverage.) The images, taken when the spacecraft was 280,000 miles (450,000 kilometers) away from Pluto, show features as small as 1.4 miles (2.2 kilometers). That’s twice the resolution of the single-image view captured on July 13 and revealed at the approximate time of New Horizons’ July 14 closest approach. Image Credit: NASA/JHUAPL/SwRI
  • Stunning Nightside Image Reveals Pluto’s Hazy Skies

    07/24/2015 12:41:41 PM PDT · by LibWhacker · 16 replies
    NASA ^ | 7/24/15
    July 24, 2015 Stunning Nightside Image Reveals Pluto’s Hazy Skies Pluto sends a breathtaking farewell to New Horizons. Backlit by the sun, Pluto’s atmosphere rings its silhouette like a luminous halo in this image taken by NASA’s New Horizons spacecraft around midnight EDT on July 15. This global portrait of the atmosphere was captured when the spacecraft was about 1.25 million miles (2 million kilometers) from Pluto and shows structures as small as 12 miles across. The image, delivered to Earth on July 23, is displayed with north at the top of the frame. Credits: NASA/JHUAPL/SwRI Speeding away from Pluto...
  • Astronomy Picture of the Day -- Ultraviolet Rings of M31

    07/24/2015 5:01:17 AM PDT · by SunkenCiv · 3 replies
    NASA ^ | July 24, 2015 | (see photo credit)
    Explanation: A mere 2.5 million light-years away the Andromeda Galaxy, also known as M31, really is just next door as large galaxies go. So close and spanning some 260,000 light-years, it took 11 different image fields from the Galaxy Evolution Explorer (GALEX) satellite's telescope to produce this gorgeous portrait of the spiral galaxy in ultraviolet light. While its spiral arms stand out in visible light images of Andromeda, the arms look more like rings in the GALEX ultraviolet view, a view dominated by the energetic light from hot, young, massive stars. As sites of intense star formation, the rings have...
  • Testing shows using microwaves to propel a craft into space might work

    07/23/2015 12:10:47 PM PDT · by Red Badger · 28 replies
    =============================================================================================== A team of researchers at Colorado based Escape Dynamics is reporting that initial tests indicate that it might really be possible to launch space-planes into space using microwaves sent from the ground, to allow for a single stage spacecraft. If the idea pans out, the cost savings for sending satellites (or perhaps humans) into orbit could be considerable. Today's rockets are all based on the same idea, a multi-stage rocket is used, each part filled with propellant that pushes the rocket into space as the propellant is burned. It is a really expensive way to go because the propellant...
  • Astronomers Spot a Intriguing ‘5-Star’ Multiple System

    07/23/2015 10:54:10 AM PDT · by BenLurkin · 12 replies
    universetoday.com ^ | on July 23, 2015 | David Dickinson
    An interesting multiple star discovery turned up in the ongoing hunt for exoplanetary systems. The discovery was announced by Marcus Lohr of Open University early this month at the National Astronomy Meeting that was held at Venue Cymru in Llandudno, Wales. The discovery involves as many as five stars in a single stellar system, orbiting in a complex configuration. The name of the system, 1SWASP J093010.78+533859.5, is a phone number-style designation related to the SuperWASP exoplanet hunting transit survey involved with the discovery. The lengthy numerical designation denotes the system’s position in the sky in right ascension and declination in...