... Tonight's Sky . ... Observing . ... An artificial comet holds secrets to Earths life . ... solar system . ... Comet crystals found in a nearby planetary system . ... Close-up of olivine crystals seen inside a meteorite found on Earth that originated from a partly melted solar system asteroid. ... In contrast, the olivine crystals found in pristine comets, such as in the material measured in the Beta Pictoris system by ESAт??s Herschel space observatory, are iron-poor but magnesium-rich. ...

... Astronomers and technicians strained to get a good view of the monitor that would soon show them the first picture taken with the newly "fixed" Hubble Space Telescope (HST). ... Tension gave way to cheers and exuberant shouts as the image of a star appeared on the monitor, a star without any of the smeared light astronomers had come to expect from the telescope's flawed main mirror. ... Scientists had already begun work on improved versions of its scientific instruments before HST was even launched....

... What's New? Bad Astronomy . ... News . ... Site Info . ... Last Saturday night (August 15, 1998) I was watching the local NBC news station , and the meteorologist was excited because their time lapse camera-- which usually shows weather changes over the day-- caught an unexpected surprise: sun pillars. ... However, what the video showed were not sun pillars, they were crepuscular rays. ... The big difference here is that pillars are vertical, while crepuscular rays spread out in all directions. ...

... Night Sky Questions . Q. I saw a bright light streak across the sky last night. ... A. Meteors are the bright trails left by fragments of natural space debris called meteoroids (usually chunks of rock or metal) falling through the EarthтАЩs atmosphere. ... As the Earth moves around the Sun over a year, planets will move in and out of view, so the sky changes.To confirm if it was one of the planets, go to www.heavens-above.com . ... Q. I saw a bright light moving steadily across the sky last night. ...

... TELESCOPE MEADE LS ACF 6' - Etat neuf . ... ТК SystУ?me optique : Advanced Coma-Free (ACF) . ... ТК DurУ?e d'utilisation avec les piles : 3 Уљ 5 heures . ... ТК Fonction GO TO vers l'un des 100 000 objets cУ?lestes stockУ?s dans la base de donnУ?es ou Уљ partir des coordonnУ?es cУ?lestes de n'importe quel objet cУ?leste avec une prУ?cision de 5 minutes d'arc. ... ТК Roue dentУ?es de 125 mm sur les deux axes pour un suivi prУ?cis des objets cУ?lestes et pour permettre l'astrophotographie. ...

... Mario Motta M.D. Goddard Space Center . ... Mario Motta M.D. Harvard Solar Observing Day CfA April 19 2015 . ... Hobby-Eberly 11 Meter Telescope . ... Lowell Observatory . ... William Lee . Marrett Pines Observatory Construction . ... Plum "Observatory" . ... Visit to the LBTO Observatory . ... Mario Motta M.D. William Knight Observatory . ... Wingaersheek Observatory . ... Mario Motta M.D. Picture Galleries . ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... The then president of the Society, Mr. Robert Burke, appointed a committee of eight or ten members, most of whom had made smaller mirrors, as an instrument committee, with Mr. Thorpe as chairman. ... Seriously, the best practicable solution seemed to be to build a machine to do the grinding and polishing. ... It was decided to grind the edges of the mirror to make it truly circular, as the rough cast glass was some 3/8 inch longer on one diameter than on the other. ...

... Imaging GRIN Rod Lens (HAG's) | Relay Rod Lens (LAG's) | ... The Refractive Index Distributions (RID) in GRIN lens preforms are made by multi-stage optimized ion-exchange diffusion between silicate mineral glasses and salt melts. ... In the LAG lenses - L ow A perture GRIN the nature of the changing of refractive index in glass via ion-exchange lies mainly in molecular volume increase. ... LAG lenses are specially treated to create the dark anti-flick surface coating (Fig.2). ...

... Astronomical Data Analysis Software and Systems VIII . ... It was held November 1-4, 1998 on the campus of the University of Illinois at Urbana-Champaign (UIUC) and hosted jointly by the UIUC Astronomy Department and the National Center for Supercomputing Applications (NCSA). ... NCSA staff also presented a two-part tutorial entitled ``Topics in Java Application Development.' ... Part 9 collects various general applications of statistics and databases to analysis of astronomical data. ...

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