December 2, 2009 =============== Version 5.1.2 released with these tasks still undone :( In order of priority -- Make an on-line guide and manual available. Implement Paramount driver. Implement Galil Driver. Provide a web interface. Revise RCOS protocol for compatibility with current version. Add RCOS rotator control. Provide a method of determining best pointing correction parameters. Fully test pointing corrections on a system capable of arc second accuracy. Produce a written user manual.

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... Sedimentary Mars . ... The total mass within giant galaxy cluster CL0025+1654, about 4.5 billion light-years away, produces a cosmic gravitational lens -- bending light as predicted by Einstein's theory of gravity and forming detectable images of even more distant background galaxies. ... Stephan's Quintet is a picturesque but clearly troubled grouping of galaxies about 300 million light-years away toward the high-flying constellation Pegasus. ... Our Moon's appearance changes nightly. ...

... Tonight's Sky . ... The Magazine . ... Observing . ... Magazine . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... What produces the "blue flash" during sunset? ... RELATED TOPICS: BLUE FLASH | ... The blue flash during sunset is a relatively uncommon phenomenon. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Universe . ... About four centuries ago, a tiny white dwarf star about the same diameter as Earth, but with a mass equivalent to the Sun, swung in a tight orbit about some larger star. The white dwarfтАЩs intense gravity tore material from its more massive companion. ... The quantity of mass in the universe is constant since the universe started its last self-replication, since its last singularity, its last pre-big bang re-birth conception. ...

... If the mass of the collapsing star is more than three solar masses, however, no force can prevent it from collapsing completely to become a black hole. What is a black hole? Mini black holes . ... For Further Reading About Black Holes A black hole is a region of space in which the pull of gravity is so strong that nothing can escape. ... A black hole with a mass less than three solar masses would not form on its own; its gravity is too weak to cause it to completely collapse in on itself. ...

Next: Galactic Gravitational Wave Background Previous: Structure of the Galaxy . We will call ``transparency'' of the background the ability of the observer to detect a gravitational wave signal other than that produced by binary systems, by means of adjusting variable parameters of an imaginary GW detector (namely, its angular resolution and frequency band), so that less than one occasional binary system falls into the detector's beam at a given frequency in a given direction. ...

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