... 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. ...

... To be read in conjunction with Section 4.11 of the WFPC2 Instrument Handbook , -Version 4.0. ... 1 The second study found evidence that CTE loss for faint stars has increased with time (Whitmore, 1998). The primary observational consequence of CTE loss is that a point source at the top of the chip appears to be fainter than if observed at the bottom of the chip, due to the loss of electrons as the star is read out down the chip (see Figure 1 ). ... Last updated: 06/16/98 10:38:00 . ...

Black Hole Signature From Advective Disks . ... CfA ), ASCA , ISAS , NASA Explanation: What does a black hole look like? If alone, a black hole would indeed appear quite black, but many black hole candidates are part of binary star systems . So how does a black hole binary system look different from a neutron star binary system ? ... A black hole system so equipped would appear much darker than a similar neutron star system. ... NASA Web Site Statements, Warnings, and Disclaimers . ...

... See Environment File. ... An SM expression is something that can appear on the right hand side of a SET command. ... A filecap file is a database used to describe the byte-by-byte format of binary files, to allow SM to read them (using the IMAGE command). ... The word list is used in a few places in the manual in the specific sense defined by the YACC grammar in `control.y' . ... Their peculiarities are described by a termcap file, allowing SM's command editor to run on (almost) any terminal. ...

... All images on this page are copyright Robert H. McNaught. ... There have been so many requests for high resolution copies of these images that I ask that all enquiries for these to go directly to Science Photo Library. C/2006 P1 on Jan 18, 10:22 UT. Photo: R. H. McNaught, Siding Spring Observatory. Canon 5D, 135mm, f/2.0, 2 sec exp., ISO 1600 . ... ISO 200 . ... Canon 5D, 50mm, f/2.0, 30 sec exp., ... Canon 5D, 135mm, f/2.0, 120 sec exp., ... Canon 5D, 50mm, f/2.0, 110 sec exp., ...

... This chapter documents all the JavaScript objects, along with their methods and properties. ... Full entries for each object appear in alphabetical order; properties and functions not associated with any object appear in Chapter 2, "Top-Level Properties and Functions." ... Tables included in the description of each object summarize the object's methods and properties. Full entries for an object's methods and properties appear in alphabetical order after the object's entry. ...

... The European HST Archive has been moved to ESA's European Space Astronomy Centre ( ESAC ), Spain, where most of ESA's Space Science Archives are located and operated from. ... The Space Telescope European Coordinating Facility (ST-ECF), jointly operated by ESA and the European Southern Observatory ( ESO ) was, until the end of 2010, the European HST science facility, supporting the European astronomy community in exploiting the research opportunities provided by the Hubble Space Telescope. ...

... Source File: mod_cern_meta.c . Module Identifier: cern_meta_module . Compatibility: Available in Apache 1.1 and later. ... There are many ways to manage meta information, this one was chosen because there is already a large number of CERN users who can exploit this module. ... Context: directory . ... Compatibility: MetaFiles is only available in Apache 1.3 and later. ... Context: (Apache 1.3) directory . ... Specifies the name of the directory in which Apache can find meta information files. ...

... 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. ...

... Data . AAS 221 . AAS 219 . ... The first thing to note is that Twitter does not guarantee to return all matching Tweets, whatever method is used (unless you have direct access to their "fire hose", which I don't). ... This should result in the same results as my REST-based search (method 2), since the volume of Tweets was probably not enough to cause this site to miss Tweets based on their collection strategy . ... A search for the tag #aas219 (case insensitive) using the Twitter REST API . ...

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) . ...

The Large Scale Structure Peak as a Comoving Standard Ruler Boudewijn F. Roukema et al. ... Just as supernovae of Type Ia appear to provide a good empirical standard candle, it now appears observationally justi ed to use the peak in the power spectrum of density per- turbations at L  130  10h 1 Mpc as an empirical standard ruler. ... Combination with the supernovae Ia data is suфcient to show that the observable Universe is almost at. ...

... Directives | ... Apache HTTP Server Version 2.2 . ... This document describes the terms that are used to describe each Apache configuration directive . ... Configuration files . ... This indicates where in the server's configuration files the directive is legal. ... A directive marked as being valid in this context may be used inside <Directory> , <Location> , <Files> , and <Proxy> containers in the server configuration files, subject to the restrictions outlined in Configuration Sections .htaccess ...

Copyright (Unpublished--all rights reserved under the copyright laws of the United States), U.S. Government as represented by the Administrator of the National Aeronautics and Space Administration. No copyright is claimed in the United States under Title 17, U.S. Code. Permission to freely use, copy, modify, and distribute this software and its documentation without fee is hereby granted, provided that this copyright notice and disclaimer of warranty appears in all copies. ...

... 2008 November 24 . Radar Indicates Buried Glaciers on Mars . ... New radar images from the Mars Reconnaissance Orbiter bolster an exciting hypothesis: huge glaciers of buried ice. ... The ice would have been kept from evaporating into the thin Martian air by a covering of dirt. If true, this would indicate the largest volume of water ice outside of the Martian pole s, much larger than the frozen puddles recently discovered by the Phoenix lander . ... About APOD | ...

Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . ... Earth Satellites . ... Leonid meteors seen from 13 km altitude aboard an aircraft during the 1999 Leonids Multi-Instrument Aircraft Campaign (Leonid-MAC). Comet Tempel-Tuttle provides the cometary debris for the Leonid meteor shower. ... Every 17-19 November Earth crosses Tempel-TuttleтАЩs orbit and the Leonids become visible. With clear, dark skies observers may see 10 to 15 Leonid meteors every hour on those mornings. ...

Next: Installing Up: General information Previous: About this guide Contents . In order to facilitate reading this manual, various fonts are used. Responses you are asked to type in at the command level appear in these fonts: hds_open, filename . ... Procedure names in the text appear like this: average , whereas widget buttons are typed like this: OPEN or D ISP C ORR , depending on whether or not they bring up a new widget or take immediate action, respectively. ...

... 08.May.95 verify.tar.Z # MIDAS verification procedures (optional) calib.tar.Z # All calibration data already installed (optional) demo.tar.Z # All demo data already installed (optional) 97NOVpl2.0.tar.gz # MIDAS 97NOV patch level 2.0 already installed and # without sources, for Linux 2.0.28 (Slackware # distribution but also verified to run on RedHat 4.2) [00-13].97NOVpl2.0.tar.gz # The previous file in 1.44 MB chunks. ... Select NAME to DELETE: - Optional: Calibration and Demo data already...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... The over-plotted solid line indicates the position of the SUMER slit, while the dashed-dotted lines indicate the EIS raster FOV. ... We aim with the present study to provide observational evidences on whether coronal hole spicules reach coronal temperatures. ... We clearly associated the red- and blue-shifted emissions in transition region lines with rotating but also with rising and descending plasmas, respectively. ...

Next: Calling Parameters Up: CAL_getLSFdefocusDist Previous: CAL_getLSFdefocusDist Contents . ... The distribution is computed according to the inner ( ) and outer ( ) radii of the XRT assemblies, so that the contribution appears like the projected telescope aperture for finite defocus distance (which is provided by CAL_getRFCdefocus ). (25) . ... Next: Calling Parameters Up: CAL_getLSFdefocusDist Previous: CAL_getLSFdefocusDist Contents Michael Smith 2011-09-20 ...