... High-velocity clouds (HVCs) were discovered by Muller, Oort & Raimond (1963) in the 21-cm line emission of neutral, atomic hydrogen. They are gas clouds which are characterised by high radial velocities incompatible with a participation in the rotation of our Galaxy. ... This suggestion was seized by Braun & Burton (1999) who identified 66 compact high-velocity clouds (CHVCs) with positional and kinematic characteristics being compatible with a distribution across the entire Local Group. ...

... Unlike the clouds on Earth which are made of water, nebulae are made up of gas and dust. ... Gas and dust are cold, so they don't glow with light bright enough for our eyes to see the hotter an object is, the brighter it shines. ... The nebula in this picture is glowing red because of a very hot star at its centre, you can see it here as the seagull's eye . ... This is dust that has been lit up by hot, young stars inside the nebula. ... The two stars orbit each other, we called them binary stars! ...

... Tonight's Sky . ... The Magazine . ... Observing . ... Magazine . ... Star Atlas . ... Astronomy for Kids . ... Is there evidence of Oort-Cloud-like structures around other stars? ... We showed that if the solar system is typical, then Oort-Cloud-like structures should commonly exist around other stars. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ... Astronomy Magazine . ...

... M110: Satellite of the Andromeda Galaxy . ... Our Milky Way Galaxy is not alone. ... Only a few stars can be found within ten light-years of our lonely Sun, situated near an outer spiral arm of the Milky Way galaxy. ... 31 Million Miles from Planet Earth . ... NGC 1316: After Galaxies Collide . ... Their investigation indicates that NGC 1316 is an enormous elliptical galaxy that started, about 100 million years ago, to devour a smaller spiral galaxy neighbor, NGC 1317, just above it. ...

Various types of stars have dust around them. In the well known case of the Pleiades the dust around the stars is unrelated to the stars, and is instead dust from an interstellar cloud that the Pleiades cluster has drifted into on its way through the galactic disk. ... The dust in interstellar space is observed in a variety of ways: due to its passive absorption of starlight ("extinction"), by its production of polarization in starlight, and then at long wavelengths due to its thermal radiation. ...

A Requiem ( April 1862 ) Skimming lightly, wheeling still, The swallows fly low Over the field in clouded days, The forest- field of Shiloh --- Over the field where April rain Solaced the parched one stretched in pain Through the pause of night That followed the Sunday fight Around the church of Shiloh --- The church so lone, the log-built one , That echoed to many a parting groan And natural prayer Of dying ...

... Archives . ... I watched a movie in which one of the characters said, ? country A has nukes with 80% chance ? ... From Bayesian perspective, Pr(p|D) ~ L(D|p) pi(p), properly choosing likelihoods and priors, one can estimate the chance of e coli infection and uncertainty. ... In other words, those computed chances highly depend on the choice of model and are very subjective. ... In order to know the chance of the model (A*B+C)*D, like A has nuke with p%, one should not rely on p-values. ...

... Day unto day uttereth speech, . ... When the Sun is near the horizon, shortly after sunrise or before sunset, a vertical pole or post casts a long shadow. ... On the other hand, the direction of south where the Sun is "highest" above the horizon does not change, and neither does that of north, of the shortest shadow of the day. ... In winter, the Sun's path is shortest, and so are the days. ... After that days get shorter again as sunset and sunrise migrate south again. ... The Sun and Seasons . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2000 May 15 . A Halo Around the Moon . ... Explanation: Have you ever seen a halo around the Moon? This fairly common sight occurs when high thin clouds containing millions of tiny ice crystals cover much of the sky. ... Exactly how ice-crystals form in clouds remains under investigation . ... About APOD | ...

... A SHRINE [LI FRIENDS] @SONG: Break Feels like this, when I'm lying Lego man, without eyes Record shop, [...] street watch Cheer him up anymore I don't lie, my life Feel depressed when I'm laughing And my friend, my own head Seems too small to contain me Have my thoughts [...] and Turn away from her sails I'm telling you I'm gonna break you down [repeat 4] Gonna break you down Gonna break you down Gonna ... As a drug can be Without lying Without lying Don't ask you to [.. ...

NASA's Galileo spacecraft radioed confirmation late this week that it has entered Jupiter's environment, crossing over the boundary from interplanetary space into the giant magnetic cocoon around Jupiter called the magnetosphere. ... On Thursday, December 7, Galileo's previously deployed atmospheric probe will plunge into Jupiter's cloud tops at 5:56 p.m. EST and descend into the giant planet on a parachute. ... Jupiter's magnetosphere is like a giant bubble around the planet. ...

Galileo Crosses Boundary Into Jupiter's Environment . NASA's Galileo spacecraft radioed confirmation late this week that it has entered Jupiter's environment, crossing over the boundary from interplanetary space into the giant magnetic cocoon around Jupiter called the magnetosphere. ... On Thursday, December 7, Galileo's previously deployed atmospheric probe will plunge into Jupiter's cloud tops at 5:56 p.m. EST and descend into the giant planet on a parachute. ... Space History Galileo . ...

Photon Scattering: Basic Principle of Photon Scattering . Audio Narration is available . No Scattering: Photon Source and Detector . ... For optical photons, scattering goes as wavelength to the -4 power. In the case of blue photons compared to red photons, this means that blue photons are about 10 times more likely to get scattered than red photons. ... Watch the blue photons scatter away from the detector . ... Interstellar dust make stars appear redder than they really are . ...

... The IAA's Observing Night + Leonid Watch at Delamont Country Park on Saturday night started well, following a good weather forecast, with crystal clear skies very little light pollution. ... But ever the optimist I set the alarm for 03.45 to allow time to get up out to a dark site if it did clear. ... The Leonids were spectacular - I had almost forgotten just how fast they are: even one streaking halfway across the sky takes less than 1/4 second! ... Clear Skies, Terry Moseley . ...

home education > resources . SEARCH ASP SITE: Match ALL words Match ANY word . ... The Universe in . the Classroom . ... Around the World . How You Can Help . Contact . ... Education from Mercury . ... Other Articles on Education . ... Astronomy Education Review . ... The Universe in the Classroom is will soon be available in many different languages and distributed around the world. The Universe in the Classroom is currently available in the following languages: . ... education | ...

Participants about project . ... makes the world a welcoming place. ... we see it shared by those who love it. ... us more aware of our own community when we shared it . with the schools around the world. ... pleased my students chose to share the feelings of . ... Our town cannot grow much as it is like an island with . other communities growning around it. ... diverse, with many Mexican people recently adding to . ... Our town is old and the new City Building looked a bit . ... city. ...

... Submitted by Al Takeda on 12/21/2010 11:27:35 . Dec. 21st Total Lunar Eclipse; Partial phase through the clouds . ... Around 1 am I could see the outline of the full Moon shining through the low cloud deck. ... Around 1:41 EST (06:41UT) I took a few images of the partial phase before the clouds thickened and completely obscured the Moon for the rest of the night. 1/100-second, f/8, ISO 800. Lens: Canon EF 400mm f5.6L + 1.4X Extender. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

Neutral "interfaces" of molecular clouds . ... During research of the distribution of neutral hydrogen around various galactic objects it was revealed 11 rather exotic "envelopes", which were identified, as thin envelopes of neutral atomic gas around molecular clouds of middle density. Their sizes are 80 X 300 pc, thickness is 15 pc, mean mass of neutral gas is 30000 mass of the Sun. The molecular clouds inside them have full density about 1000 cm(-3). ...

GALAXIES cenA .tiff 40 Bright Radio Galaxy M31.tiff Nikon Andromeda Galaxy (note HII regions in spiral arms) ngc6744.tiff 40 NGC 6744 a face-on spiral clouds_20d.tiff H'blad The Magellanic Clouds our nearest neighbours Lmc_7.tiff Nikon The Large Magellanic Clouds Lmc_zoom.tiff Nikon Detail of previous image smc_7.tiff Nikon The Small Magellanic Clouds smc-zoom.tiff Nikon Detail of previous image 30dor_40_BVR.tiff 40 The 30 Dor ... B [OIII] Halpha trifid.tiff 40" The Trifid Nebula. ...

... 2011: . Detection of galaxies with large peculiar velocities . ... New galaxies with polar rings . ... The new catalog contains 275 galaxies. ... Radio galaxy RC J0311+0507, a unique object of the early Universe . ... The estimation of the stellar population age in the host galaxy via the multicolor photometry (BTA) and new infrared data (UKIRT, 2011), amounting to 0.8 Gyr results in the moment of its formation when the universe was about 0.5 milliard years old (z~10). ... Archive . ...