... 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. ...