... APOD: 2007 August 1- Unusual Cratering on Saturns Dione . ... Credit Copyright: Cassini Imaging Team , SSI , JPL , ESA , NASA Explanation: Why does one half of Dione have more craters than the other? Start with the fact that Saturn 's moon Dione always has one side that faces Saturn, and always has one side that faces away. ... August 2007 . ... Publications with keywords: Saturn - Dione - crater . Publications with words: Saturn - Dione - crater . ... A Close Pass of Saturns Moon Dione . ...

... 2007 August 1 . Unusual Cratering on Saturn's Dione . Credit: Cassini Imaging Team , SSI , JPL , ESA , NASA . Explanation: Why does one half of Dione have more craters than the other? Start with the fact that Saturn 's moon Dione always has one side that faces Saturn, and always has one side that faces away. ... But the current leading half of Dione is less cratered than the trailing half! ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . ...

... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

... Jitter is usually very small in magnitude and random in effect, and is not expected to lead to systematic throughput changes. ... However, such a change should lead to an obvious decline in the strength of the comparison lines at one end of the spectrum relative to the other and not an overall decline in counts. No such effect is seen (the counts decline evenly from one end of the spectrum to the other). ... The value changes steadily, but not by enough to account for the changes in counts seen. ...

... About meteorites . ... Meteoritic data . Impact Crater Smerdyachee . ... Based on Smerdyachee's depth, near circularity, and its mounded wall, and analysis by N.A. Fillin of nearby Roshal, Russia, the Estonian scientists Yu.V. Krestlane and K.H. Mella proposed in 1987 that Smerdyachee Lake is a meteorite crater. ... In 2002, the Laboratory of Meteoritics of the Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences explored this mysterious lake. ...

... Read Mark BosloughУ?т??т??s blog on the Jupiter impact . ... Mineral analysis of lunar crater deposit prompts a second look at the impact cratering process . Researchers have discovered a rock body across the floor of Copernicus Crater that appears to bear the mineralogical signature of rocks that were present before the impact that made the crater. ... Not detectable in the crater image (inset), deposits are visible only in light at certain wavelengths. ...

Phobos . ... Phobos [FOH-bohs] (fear) is a moon of Mars and was named after an attendant of the Roman war god Mars. ... Phobos shows striated patterns which are probably cracks caused by the impact event of the largest crater on the moon. ... Grooved fractures caused from the impact that created Stickney extend away from the crater. ... Because Phobos is only 28 by 20 kilometers (17 by 12 miles), the moon must have been nearly shattered from the force of the impact that caused the giant crater. ...

Phobos . Mars I . Phobos [FOH-bohs] (fear) is a moon of Mars and was named after an attendant of the Roman war god Mars. ... Phobos shows striated patterns which are probably cracks caused by the impact event of the largest crater on the moon. ... The striking feature in this image is the giant Stickney crater. ... Courtesy NASA) . ... Because Phobos is only 28 by 20 kilometers (17 by 12 miles), the moon must have been nearly shattered from the force of the impact that caused the giant crater. ...

M1 image More About M1 Nice Color Picture . ... M16 image More About M16 HST image . ... M31 image More About M31 Nice Color Picture . ... M42 image ; M43 image More About M42/43 Nice Color CCD Picture . M51 image More About M51 Color Image of M51 M51 Supernova . M57 image More About M57 Nice Color CCD Picture Very Deep M57 Image . ... M81 image More About M81 M81 Supernova Ultraviolet Image of M81 More about Ultraviolet Imaging . M82 image More About M82 M82 False Color M82 True Color . ...

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... 4.4 Imbedding HTML in a Document . In the following discussion of SPECIAL processing
, I will assume that rtftohtml has not been customized. If it has, the text styles used to create special effects may be different. ... Normally, if your RTF document contained the text "<cite>hello</cite>", the translator would output this as: "&lt;cite&gt;hello&lt;/cite&gt;". ... If, however, you want the <cite></cite> to be interpreted as HTML markup, you must format the tags using Hidden and Shadow. ...

... File view and tree view . ... Show (expand) directory tree starting from that point (the sign appears near directory name). ... Alternative way is to click on a [+] sign which appears near directory names throughout the archive (it will bring the tree into view from that directory). ... E.g., searching for "nftp" will find "nftp103.zip", "nftp/readme" and so on. ... nftp*" will find all files (NOT directories) which have the characters "nftp" in their names, including "nftp103.zip" and "about.nftp";...

XMM-Newton Science Analysis System . ... This check identifies the time intervals when any of the EPIC instruments is in counting mode. This is done by looking at the counting cycle report data in the ODF. The following anomalies are detected and lead to a warning: . A counting mode interval appears from the data to have a negative duration. A counting mode interval appears to have lasted longer than the exposure it belongs to. ... XMM-Newton SOC/SSC -- 2005-08-16 ...

... High-resolution Halpha observations reveal the existence of an unusual bar in the disk of NGC 1808 at a position angle of 155 degr, about 20 degr offset from the major axis. ... A remarkably similar bar has been found in the galaxy NGC 7479. The outer parts of the HII region chain in NGC 1808 coincide with maxima in the HI gas distribution and further out connect to the outer spiral arms. The streaming of gas along the bar is clearly seen in the HI velocity field. ...

... A rough estimation is that in the United States there is one planetarium per 100,000 population, ranging in size from the Hayden Planetarium's 20-meter dome seating 430 people, to three-meter inflatable portable domes where children sit on the floor. ... Together dblo associates make a huge impact in the architecture, interior design and development arena in London. ... With the holidays around the corner what better way to spoil your family than with your very own private home cinema. ...

... Circumstellar disc of beta Pictoris: constraints on grain properties from polarization. To appear in the Astronomy & Astrophysics . abs , src , ps ] . ... Dust influx to Titan from Hyperion . ... abs ] . ... Characteristics of bulges and disks in interacting galaxies . ... Dust grains around Herbig Ae/Be stars: porous, cometary-like grains? ... To appear in the Astronomy & Astrophysics Supplement . ... Finally, Links may lead you to more options (e.g. via the LANL preprint system). ...

... There are TPM log files for every night of the dark run except for the nights of 08 October and 14 October 1999. ... The figures below are plots of the MIG data with the y-axis in TPM MIG units (real MIG units*1000) and the x-axis in seconds since midnight. ... Figure: Plot of MIG values vs elapsed time from midnight 10 October 1999. ... Figure: Plot of MIG values vs elapsed time from midnight 08 October 1999.The plot starts recording data from 21:26:52.0 on that day. ... 11/24/1999 ...

... The awsome spectacle of a brilliant comet, with its long ghostly tail streaming behind it, is a rare event. ... Only one other comet, Comet Halley, was seen so far from the Sun, giving scientists an opportunity to watch it as it slowly warmed up and sprouted a tail. ... Comets are the Rip Van Winkles of the solar system -- mini-worlds that have changed little during their 4.5-billion-year nap far from the Sun. ... Observing Comets . ... Once, comets inhabited the entire solar system. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Moon . ... You may initially think this is something that only an astrophysicist could describe but put in simpler terms, TLPтАЩs are the short-lived changes in brightness in areas on the surface of the moon, appearing as quick bright flashes, with some lasting seconds and some lasting for hours! ... They catalogued 579 lunar events from 1540 until 1967, one year before Neil Armstrong and Buzz Aldrin put their feet on its surface. ...