... Credit Copyright: Daniel Fischer ( Cosmic Mirror ) Explanation: Sometimes, during a total eclipse of the Sun, a strange shadow of darkness can be seen stretching off into the distance. ... Shadow cones are particularly dramatic for eclipses near the horizon , as geometry creates a long corridor of sun-blocked air. Visible above is a shadow cone caught during a sunset total solar eclipse visible last month from Patagonia , Argentina . ... Publications with keywords: total solar eclipse . ...

... 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. ...

... 2003 January 6 . Shadow Cone of a Total Solar Eclipse . ... Explanation: Sometimes, during a total eclipse of the Sun, a strange shadow of darkness can be seen stretching off into the distance. Called a shadow cone, they are visible because the Earth's atmosphere is not completely transparent, scattering sunlight and hence appearing blue during the day. ... Visible above is a shadow cone caught during a total solar eclipse visible last month from South Australia . ... About APOD | ...

Educator's Guide to Eclipses . ... In a solar eclipse you observe the Sun (using only safe methods, of course). ... In a lunar eclipse you observe the Moon. ... Because of the geometry described below, you can only view a solar eclipse when the Sun is up, and the Moon is nowhere to be seen. ... Eclipses occur when the Sun, Earth and Moon line up. ... In a solar eclipse the Moon passes directly in front of the Sun. ... In a lunar eclipse the Moon moves into Earth's shadow. ...

The Sun's corona . ... For instance, short "plumes" rising from the polar regions of the Sun look very much like field lines coming out of the end of a bar magnet, and they therefore suggest that the Sun, in addition to the intense fields of sunspots, also has a global magnetic field like the Earth's. Arches above the . Sun's surface . ... It is brightest near sunspots, whose arched field lines apparently hamper the outflow of solar wind which carries away energy and helps cool the corona. ...

Armagh Observatory, 17 January 2000 . Sky watchers will be treated to the first total lunar eclipse of the year on the morning of Friday, 21st January, weather permitting. A total lunar eclipse occurs when the Moon completely enters the dark shadow cast by the Earth. ... The most spectacular part of the eclipse, the total phase, lasts from 4:04 a.m. until 5:23 a.m. when the whole Moon is within the Earth's dark (umbral) shadow. ... Last Revised: 18th January 2000 . ...

... Gift Center . ... Why do aurorae appear strongest within rings centered on Earth's poles instead of filled-in circles? ... RELATED TOPICS: AURORAE . The visible aurorae result from electrons that move along magnetic field lines from space into the upper atmosphere. ... Just make sure you're registered with the website. Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ...

adapted from Observe: Eclipses, published in 1979 by the Astronomical League and "Safe Solar Filters," by B. Ralph Chou, Sky and Telescope, August 1981) . ... Tape TWO pieces of film together into a sandwich, and tape this over the opening in the cardboard. ... The cardboard frame will act as a shade from the bright Sun, while you safely observe through the film sandwich. ... Undeveloped film is not safe. ... tape . ... At the end of one of the tubes, tape the aluminum foil, and make a tiny pinhole. ...

... Solar Wind . ... During a total eclipse of the Sun, when for a few minutes the Moon completely covers the Sun's face, a glow appears around the darkened Sun--the solar corona, the Sun's outermost atmosphere. ... Such high levels of ionization require the atoms to be buffeted around by extremely high temperatures, around 1,000,000 C (1,800,000 F). ... It is brightest near sunspots, whose arched field lines apparently hamper the outflow of solar wind which carries away energy and helps cool the corona...

HUBBLE SPACE TELESCOPE DAILY REPORT #1102 PERIOD COVERED: 0700 EST Daily Status Report as of 083/1200Z. 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed GHRS/1 5277 (GHRS Side One Spectral Lamp Test: Cycle 4) The High Resolution Spectrograph (Side One) was used to make internal spectral lamp wavelength calibrations. ... The GHRS internals appeared to complete without apparent anomaly, except for a carrousel lock failure. ... The baseline guide star acquisition failed. ...

June 21, 1999 Version 2.0 Introductory Astronomy Survey 1. ... When the Moon appears to completely cover the Sun (an eclipse), the Moon must be at which phase? ... PLEASE TURN THE PAGE ©1999 The Collaboration for Astronomy Education Research (CAER) 1 June 21, 1999 Version 2.0 7. ... A. Leo C. Gemini E. Pisces B. Cancer D. Taurus Sun Gemini Cancer Leo East South Taurus Pisces West PLEASE TURN THE PAGE ©1999 The Collaboration for Astronomy Education Research (CAER) 2 June 21, 1999 Version 2.0 11. ...