... The collecting area is increased by nesting concentric mirror pairs, all having the same focal length. ... Figure shows the largest optical element being ground at HDOS. ... X-ray testing demonstrated that the CXO mirrors are indeed the largest high-resolution X-ray optics ever made; the nominal effective area (based on the ground calibrations) is shown as a function of energy in the left panel of Figure , along with those of their Einstein and ROSAT predecessors. ...

... Comet Animation . ... Comet structures are diverse and very dynamic, but they all develop a surrounding cloud of diffuse material, called a coma, that usually grows in size and brightness as the comet approaches the Sun. ... As comets approach the Sun they develop enormous tails of luminous material that extend for millions of kilometers from the head, away from the Sun. ... The evaporated molecules boil off and carry small solid particles with them, forming the comet's coma of gas and dust. ...

An Ancient Universe: How Astronomers Know the Vast Scale of Cosmic Time . THE SUN . The Sun. Our star, the Sun, is a powerhouse of nuclear energy, shining via a process called nuclear fusion. Deep in its core, smaller atomic nuclei are smashed together into larger ones, releasing energy each step of the way. This image, taken in 1973, from Skylab, the early US space station, shows an enormous eruption (flare) on the Sun's surface. ... The Age of the Oldest Stars . ...

... Meteors and Meteorites . ... By admin August 2, 2011 Posted in: August . 13 August 2009: A perseid flashes through the sky (Image credit: Andreas M†ґller via wikimedia.org) . ... Not all meteors are sporadic events, the regular meteor showers occur when the Earth bulldozes through a great swarm of meteoroids drifting in orbit round the Sun. ... They are at their best in the pre-dawn hours, as the face of the Earth turning towards the Sun catches more meteors as the Earth moves through space. ...

... High Horse You had your chance to show affection You had your chance to give me more And now that she's found new direction You make your way to my back door What makes you think the whole world wants you Give steel a kiss and it will bend The flesh is weak, but when all is said and done Spirit's all that's left in the end CH: If you have to saddle your high horse Go on and ride out of my sight You never had the time of ...

... Bad Astronomy . Misconceptions . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Comets are not "dirty snowballs" . ... Miscellaneous nonsense . ... Imagine McCanney's scenario: an asteroid the size of the Moon is moving through the solar system. ... The particle is moving pretty fast, and that motion has energy (called kinetic energy). ... Obviously, that's so much energy that it would easily vaporize the comet. ... 2008 Phil Plait. ...

The study of energetic particles acceleration and transport within the magnetosphere and on its boundaries is the main goal of DOK-2 experiment on Auroral Probe in a frame of INTERBALL project. ... DOK-2 uses two pairs of energetic particle telescopes . ... This information is available only during the most informative Real Time mode of DOK-2. ... Full 56-57 channel spectra accumulated during time intervals from 10 s to 1464 s depending on a particle intensity. ... For this time interval: . ...

... RSDC . ... Press Releases (rus) || in Russian RSDC Quick Jump 9-year Galactic survey Catalog of sources 7-year Galactic Bulge Map Cleaning IBIS/ISGRI sky images IBIS/ISGRI Sensitivity vs. ... The INTEGRAL view of the Galaxy . ... May 2012: 9-year Galactic plane survey . ... They are ISGRI (higher plane detector of the IBIS telescope), JMX1 and JMX2 - two detectors of the JEM-X telescope. ... RSDC is actively participating in the all-sky survey carrying out with INTEGRAL observatory. ... 2016 IKI RAN...

The Sun 11 Solar radio bursts study with high spatial and temporal resolution V.A. Alexeev, A.F. Dementyev, B.N. Lipatov, V.F. Melnikov, M.B. Nechaeva, S.D. Snegirev, Yu.V. Tikhomirov Radiophysical Research Institute NIRFI, Nizhny-Novgorod, Russia Theoretical and experimental researches of the energy release fragmentation in solar ares need observations with high spatial 0.01 1 arcsec and temporal 1 ms resolution. ... Several VLBI stations all over the Russia were supplied by this set of equipment. ...

STEP INTO THE BLUE - MEADE INSTRUMENTS PRODUCT GUIDE . ... Telescopes . LX850 Series . ... For over 30 years, itтАЩs been our passion to create the finest telescopes available for the astronomy enthusiast. ... Events . Meade Events . ... Event Calendar . Northeast Astronomy Forum & Telescope Show (NEAF) . ... Meade is happy to announce that we will be attending the Northeast Astronomy Forum & Telescope Show, a.k.a. NEAF, one of the largest astronomy trade shows in the United States. ...

... Astronomy news . ... Saturnian Moon Shows Evidence Of Ammonia . Data collected during two close flybys of Saturn's moon Enceladus by NASA's Cassini spacecraft add more fuel to the fire about the Saturnian ice world containing sub-surface liquid water. ... In space, the presence of ammonia provides strong evidence for the existence of at least some liquid water. How could ammonia equate to liquid water inside an ice-covered moon in one of the chillier neighborhoods of our solar system? ...

New England observer Lew Gramer, fresh back from his mid-November fish observing and meteor-catching expedition in South Florida, reports that December also promises to be a great month for celestial sky-sparks!" ... Other showers adding to the mix this month include several very minor showers, such as the Chi Orionids (3 Dec), Monocerotids (9 Dec) and Sigma Hydrids (12 Dec), which usually contribute no more than 2 or 3 meteors per hour during even post-midnight observing this month. ...

... A rough estimation is that in the United States there is one planetarium per 100,000 population, ranging in size from the Hayden Planetarium's 20-meter dome seating 430 people, to three-meter inflatable portable domes where children sit on the floor. ... Together dblo associates make a huge impact in the architecture, interior design and development arena in London. ... With the holidays around the corner what better way to spoil your family than with your very own private home cinema. ...