Next: Extinction efficiencies: general behaviour Up: Optical properties of cosmic Previous: Optical properties of cosmic . It is now evident that observed interstellar extinction cannot be explain using particles of only one kind. ... The intensity of radiation after passing a dust cloud is equal to . ... The interstellar extinction is . ... Next: Extinction efficiencies: general behaviour Up: Optical properties of cosmic Previous: Optical properties of cosmic root 2003-04-09 ...

... Tonight's Sky . ... Get to Know the Night Sky . ... Mars rover Curiosity uses arm camera at night . ... This image of a martian rock illuminated by white-light LEDs is part of the first set of nighttime images taken by the Mars Hand Lens Imager (MAHLI) camera at the end of the robotic arm of NASA's Mars rover Curiosity. ... NASA's Mars rover Curiosity for the first time has used the camera on its arm to take photos at night, illuminated by white lights and ultraviolet lights on the instrument. ...

Astrophotography Forum Message . ... Eyepieces ћ Meade ћ Misc. ... Post . ... RE: Meade LX 200 . ... Post Message | ... I've never used a Meade LX 200 before, but from everything I've read, they're comprable in most respects to the Celestrons. ... Obviously, it's dangerous to purchase a used scope if you can't check it out before hand. ... www.astronomy.net . ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

The ESA/ESO Astronomy Exercise Series 2 . The Distance to Messier 100 as Determined by Cepheid Variable Stars . ... The small variations in distance to the individual Cepheid variable stars in the Cloud are negligible compared with the much larger distance to the SMC. ... In this way Cepheid variable stars can be used as one of the 'standard candles' in the Universe that act either as distance indicators themselves or can be used to calibrate (or set the zero point for) other distance indicators. ...

... Space flight . Crew training . ... Orlan-DMA-GN" is used in the neutral buoyancy facility of the Yu. Gagarin Cosmonaut Training Center and is designed for cosmonauts training under neutral buoyancy conditions for mastering the forthcoming EVA operations programs. ... Since there is an air between the space suit layers and the cosmonaut's body, the reverse affectation decreases sharply (a peculiar self-control of an organism, mostly subconscious, which flows via the feedback channels). ...

... About ATMoB . ... The ATMoB has established an email list server with various mailing lists for use by our members. ... This list has been established for use by ATMoB members, friends of members, and anyone interested in astronomy with a focus on things of interest to those in the greater Boston area. ... Notice: The owners of this server, the Amateur Telescope Makers of Boston, and any other sentient beings that happen to be involved assume no responsibility for any messages posted via this system...

... Bad Astronomy . ... Mad Science . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... How did early astronomers determine the distance form earth to the sun, and what method is used today to determine distances in space? ... Since Huygens knew the Sun-Venus-Earth angle (from the phases), and he could directly measure the Sun-Earth-Venus angle (simply by measuring Venus' apparent distance from the Sun on the sky) all he needed was to know the distance from Earth to Venus. ...

The summary plot shows the monthly time distribution of all predicted magnetic conjugations between four spacecraft considered. ... To show the time of conjugation, in frame of the corresponding day for each SC the corresponding colour and line are used: . for the first SC the red color and the first line are used, . ... On the plot the SC names are shown by the corresponding colours. The summary plot permit to find the simultaneous magnetic conjugations of 3 and even 4 satellites. ...

FEATURES OF RSC ENERGIA'S MARTIAN MISSION CONCEPT . ... for the interplanetary . ... Then, using propulsion units, this vehicle is injected into the interplanetary trajectory, and over the next few months the vehicle transits to Mars. ... A special lander separates from the main section of the vehicle to take to the Martian surface the mission crew or a part of the crew. ... Key data on the interplanetary vehicle of the RSC Energia concept . ... Official WEB-site of S.P.Korolev RSC Energia . ...

... 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). ...

... Copyright of Images . I would like to thank each one of you who has taken the time to browse through this tour of the solar system. ... Here are some general conditions for use of this information. The Views of the Solar System web site along with many of the images and information are copyrighted by Calvin J. Hamilton . Many of the images come from NASA or other government sources and are in the public domain. ... Any NASA or JPL image can be freely used, but please give them credit. ...

... Copyrightї1997 Bob Yen (byen@ix.netcom.com) (http://www.comet-track.com/hb/hb.html) . ... Information on Comet Hale-Bopp for the Non-Astronomer Hale-Bopp rotates about twice a day (3/14/97) . ... The Comet Observation Home Page was been selected to receive the Griffith Observatory Star Award for the week of February 2 - 8, 1997 for excellence in promoting astronomy to the public through the World Wide Web. ... Typically, about 1,000 individual users/computers access this page every day. ...

... The function is accessible, if the file with the image is open, and Ю identification of a star field is made. ... a) Load a first image by the command " Open ", and others by the command " Open +". b) Make an identification of the field. c) Open the menu " File ", select " Next " or press . ... It is necessary tree or more images. a) Load the first image by the command " Open" , and others by the command " Open + ". b) Open the menu " Marking ", select "Detect moving objects" or press - . ...

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... We then switched the outputs of the half band filter for 3a,4a. When we did this, the problem moved to sbc3A . This shows that the problem is in the half band filter chassis. Cycling the power on the half band filter chassis did not fix the problem. ... After this the problem went away. ... The problem was in the half band filter chassis. A higher tsys could result if the half band filter was configured incorrectly and a wider bandwidth was pushed through when a narrowing was expected. ...

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