Umbriel . Uranus II . ... It is about the same size as Ariel and has about the same density. The surface appears to be old with large craters and does not change much from one location to another. ... Orbital period (days) . ... Visual geometric albedo . ... This image is a polar stereographic projection of the southern hemisphere of Umbriel. ... Dark regions are represented as red and bright regions are represented as blue. The two white regions are bright ejecta from two fresh craters. ...

... 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. ...

... Article text . ... Article should be formatted according to the present rules, using the styles containing in the attached file example.doc . ... For example, article name should be typed in string Here Is the Paper Title , using style "title paper", etc. ... Title part of article Paper Title (style Title Paper . ... It is necessary to use style text paper for the body of article. ... In the text of article there should be links to every Figure and Table: Fig. 1 and Tab. 1 accordingly. ...

The Many Streams of the Magellanic Stream . ... As a part of the ongoing GALFA survey we have obtained an H I image of a region located at the tip of the Magellanic Stream. ... Figure 1 shows the velocity field of the tip of the Stream. ... Comparison with numerical simulations by Connors et al. (2006) suggests that a 3-way splitting of the main Stream filament may have taken place due to gravitational interactions between the SMC, the LMC, and the Galaxy. ... 2006) . ...

Astronomy Picture of the Day . M81: A Bulging Spiral Galaxy . ... The blue regions in this picture - representing ultraviolet light - highlight regions of bright young stars and star formation and appear rare than in M74 and M33. The red regions - representing the visible light - show a large population of older, less massive stars. Ancient Cratered Plains on Ganymede . ... M74: A Grand Design Spiral Galaxy . ... The spiral galaxy M33 is a mid-sized member of our Local Group of galaxies. ...

... Tonight's Sky . ... Observing . ... Sky this Month . ... Astronomy for Kids . ... Can you explain Mercury's retrograde motion? Do other planets appear to do this also? ... When astronomers talk about retrograde motion, generally they refer to the apparent motion outer planets make as Earth passes them while orbiting the Sun. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Duchamp | ... Top | Duchamp is a solution to this problem of three-dimensional source finding. ... A list of the detections and their properties, as well as the input parameters that were used. [text file] . ... It can be downloaded in source format, in a gzipped tar archive. ... Changes from the previous version can be seen here (this file is included in the tar archive), while the archive files and documentation from the previous release versions are here , if you are really interested. ...

... We publish 16 Doppler imaging temperature maps for the years 1994-2002 of the active RS CVn star II Peg. ... Through Doppler imaging we want to study the spot evolution of the star and in particular compare this with previous results showing a cyclic spot behaviour and persistent active longitudes. ... The derived temperature maps are quite similar to the ones obtained earlier with a different methods, the main differences occurring in the spot latitudes and relative strength of the spot structures....

Browse the articles below for new ideas for your classroom. Mercury September/October 2005: Astronomy Education and Public Outreach: Steps and Missteps Toward an Emerging Profession (pdf) . Focus on Education articles as they appeared in Mercury: . ... March/April 2000: . ... Education Newswire articles as they appeared in Mercury, by issue. ... January/February 2000 . November/December 1999 . ... March/April 1999 . ... November/December 1998 . ... November/December 1997 . ...

... The changebar (represented by two hyphens in the image) appears in the 10px space to the left of the paragraph. The illustration shows a vertical line that represents the left edge of the paragraph's containing block. ... The change bars (two red hyphens) appear to the left of the word "THIS", which begins the fourth line of text. The following PRE element simulates the example. Vertical bars represent the left containing block edge. ... to the left of the line containing | ...

Guest Editorial , July 2006 . Past ? Present ? Future . ... SETI, the quest for reasonable signals from Space, is aimed at the Past. ... From here on Earth, we can say with good reason that conducting both searches (SETI) and transmission (METI) of reasonable signals, we appear poised just halfway between the Past and the Future: namely, in the Present! ... This editorial was submitted in response to Their Past, Our Future , by SETI League executive director emeritus H. Paul Shuch. ...

Summer Triangle . Articles | ... As dusk deepens into night in early June, look a bit north of east, not real high in the sky, for a sparkling blue-white star, whose name is Vega . ... Since the stars rise some four minutes earlier with each passing day, expect the stars of the Summer Triangle to light up the twilight dusk around middle to late June -- a sure harbinger of the change of seasons, of spring giving way to summer. ... Re-published on Astronomy Net with permission of the author. ...

. You can leave text in its present location and move a copy of it to a different location. This is useful when you have a special paragraph that you want to repeat in a number of locations. To copy a block of text: . 1. Define the 'region' . 2. Type the M-C instruction to 'copy' the 'region'. 3. Move the cursor to the place where you want the copied text to go. 4. Type ^Y to 'yank' the text. A copy of the text moves from the 'kill' buffer and appears at its new location.

... A hundred years later, a handful of Tunguska-sized asteroids have been spotted by telescopes, but most remain unseen. The asteroid designated 2008 TC3 , which made the news on October 6th before colliding with the Earth on October 7th was too small to constitute a part of the "Earth impact hazard". ... 2008 TC3, for example, finally exploded in the atmosphere above Sudan . ... Wednesday, 8 October 2008 01:15 . International Year of Astronomy, Ireland National Node . ...

Note added 3 June 2003 to . ... Furthermore, (iii) its orbital plane gave the satellite at apogee a velocity tangential to the ecliptic, helping it stay in the plasma sheet, rather than cut across it. ... Figure #1 Point A in this drawing is perigee (just above Kourou), B is apogee , the solid line perpendicular to the Earth axis is a cut through the equatorial plane, and its continuation parallel to the ecliptic represents a cut through the plasma sheet (not to scale). ...

Making HST Pictures: Examples and Illustrations . ... These illustrations represent some of the steps and techniques used to produce “pretty pictures” from HST images. ... TIFFs (ftp) . ... Separate images are exposed through different color filters. ... An alternate way to make color images . ... Eight bit (one byte) images contain 256 different values that may be represented by 256 shades of gray or 256 arbitrary colors from a color map (or palette) of all possible colors. ...

JSC Turns 40 Home | ... Gallery . Johnson Space Center at 40 Years Imagery . ... S77-23480 (August 1977) --- An interior view of the Skylab Orbital Workshop (OWS) trainer located in Building 5, Mission Simulation and Training Facility, at the Johnson Space Center. This is the OWS's forward compartment. This compartment has the water supply, some experiments, locker stowage, etc. ... The OWS's crew compartment is on the other side of the floor of this compartment. ...

Stellar Clusters are very useful laboratories for empirically studying stellar evolution. ... All cluster stars are at the same distance . All cluster stars have the same physical age . ... CM diagram Young Cluster In this case we see the Main Sequence fully represented. The blue dots represent massive stars with short main sequence lifetimes. ... Thus, identifying the most massive star which is still on the main sequence is an effective means of determining the age of a stellar cluster. ...

... To get access to the software you must be registered at the ASC RadioAstron Server "ra.asc.rssi.ru" ------------------------------------------------------ IMPORTANT: At present the software "FAKERAT" runs only under 32 bit Linux workstation in X windows with C shell script. ... All procedure runs under C shell. ... Copy all files from the given directory to your computer. ... Then, copy txt-file representing the current version of orbit to the "orbit" subdirectory located in "fakerat_07041020". ...

... July 13, 1996 . M81: A Bulging Spiral Galaxy . ... Explanation: Few stars are still forming in the old giant spiral galaxy M81. The blue regions in this picture - representing ultraviolet light - highlight regions of bright young stars and star formation and appear rare than in M74 and M33 . ... M81 is therefore classified as spiral galaxy type "Sab" on the Hubble Sequence of Galaxies . ... A massive density wave circulates around the center of spiral galaxies. ... About APOD | ...