... November 19, 1997 . Diffraction Spikes: When Stars Look Like Crosses . ... Light scatters away from the original destination point ending up elsewhere and appearing as " diffraction spikes ." These annoying spikes steal precious light from the central image and hide light from fainter, more interesting stars. Above, astronomers are more interested in the half-circled point near the image center, than the cool-looking diffraction spikes from the bright star at the bottom. ... About APOD > . ...

... Answer: Stars live different lengths of time, depending on how massive they are. ... All stars age at different rates, depending on how massive they are at the start their lives. The stars in this photograph are part of an open star cluster called NGC 3293, containing around 50 stars that were all born around the same time. ... Each star in this cluster is much more massive than our own. ... This is a gigantic Red Giant star, around six and a half times larger than the Sun! ...

12feb07 Measuring the SEFD around 1100 Mhz . ... bandpass filter low frequency falloff around 1130 Mhz . ... A 500 Mhz bandpass centered on 1100 Mhz (via the spectrum analyzer) showed a 6 db difference between 1100 Mhz and the noise floor at 1000 Mhz. ... The interim correlator was used with 25 Mhz bands centered at: 1040, 1060, 1080, and 1100 Mhz. ... 1040 Mhz cfr trking src(.gif) There is probably not very much sky signal getting into this band so it looks better than it should. ...

... Tonight's Sky . ... Sky this Month . ... Star Atlas . ... stars . ... The Sky This Week: April 1 - 10 . ... Observing springtime deep-sky objects with a large telescope . ... Why do some stars appear to flash a variety of different colors when you look at them through a telescope? ... So, Earthò??s atmosphere will bend some colors from especially bright stars more so than others, which makes the source look like itò??s flashing colors. Get instant access to subscriber content on Astronomy.com! ...

... Project 183B. Final Report (in ukr). Project 183B. Publications (in ukr). Project 207. Final Report (in ukr). ... Dictionaries from Rambler.ru . Dictionaries from Meta.ua . Online Dictionary: a US site . The William Strunk, Jr. guide to Stylish English . ... Ukrainian and/or semi-ukrainian:) Papers . www.pravda.com.ua in Ukrainian and in English . ... BBC ukrainian . ... Trains to/from Kyiv . Map of Kyiv (mapia.ua) . ...

This is the homepage of Andrew Fruchter, an astronomer on the staff of the Space Telescope Science Institute . ... Here you can look at an HST images of the optical counterparts of gamma-ray bursts and their host galaxies. ... Therefore, substantial information on the fine scale structure of objects can be obtained by offsetting the pointing of the telescope between exposures and then combining these "dithered" exposures into a single image. ...

... If the Earth is round, the Sun must be north of the equator in northern summer, and south of the equator in northern winter. ... From the Earth's perspective, the Sun is spiraling from north to south and back again along the ecliptic (see figure 7 ). ... The round Earth, at the summer solstice. ... If the rotation axis of the Earth is tilted with respect to its orbit, the equator bobs back and forth, causing the Sun to be north for half the year, and south for the other half (see figure 9 ). ...

... Bad Astronomy . Misconceptions . ... Bad Astronomy : The Moon only shows one face to us because it is not rotating. Better astronomy : The Moon only shows one face because it is rotating, once every time it revolves around the Earth. ... Place the Moon model on the table about 30 centimeters (one foot) away with the X facing the Earth model. ... You'll see that to keep the X facing the Earth model, you have to rotate the Moon model as it goes around the Earth model . ... 2008 Phil Plait. ...

... Spacecraft . ... To space by cannon? Finally, the deep space explorers --spacecraft which break away from the Earth's gravity . ... The "Luna" series of the USSR conducted 7 soft landing of unmanned probes, two of them with wheeled robotic "Lunokhods," and two of those missions returned samples to Earth. Others spacecraft have visited the major planets of the Solar system. ... The Mariner series have explored Venus and Mars--and Mariner 10 even reached Mercury, for three separate encounters! ...

... 26.03.2004 . Look up into the sky tonight and without a telescope or binoculars you might have a view like this one of Moon, planets and stars. The lovely photo was taken on March 23rd, and captures the crescent Moon on the horizon with Venus above it. ... Intriguing Dimples Near Eagle Crater on Mars . ... Asteroid 2004 FH Whizzes By . ... Asteroid 2004 FH posed no danger, but became bright enough to see with binoculars. ... A Green Flash from the Sun . ... It's a green flash from the Sun. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Our Galaxy . ... Stars . ... Other Galaxies . ... Light of other eyes, other times: The X-rays and IR radiation making up the image have been travelling for a long time. ... The inspiration here came from a new ESA image of M31, the Andromeda Galaxy, composed from two very different images. ... Our nearest galactic neighbour, the Andromeda Galaxy?s brightness is caused by the hundreds of billions of stars that are contained within. ...

. XMM-Newton Science Analysis System . sas (gui-1.52.8) [xmmsas_20080701_1801-8.0.0] . Meta Index / Home Page / Reference documentation You can alter the look and feel of the GUI by changing the used fonts or using a different style for the buttons, menus etc... Subsections . Supported styles . Supported fonts . XMM-Newton SOC/SSC -- 2008-07-01

... B elfast City Council, 9 June 2008 : BelfastÁ€™s new Lord Mayor, Councillor Naomi Long, will be inviting the people of the city to literally Á€˜Look UpÁ€™ at the stars later this month. The Belfast City Carnival will help celebrate the International Year of Astronomy, when one of the highlights of the cityÁ€™s cultural calendar takes to the streets on Saturday 27 June. ... Direct link to the press release from Belfast City Council . International Year of Astronomy, Ireland National Node . ...

Since the light from galaxies represents the integrated contribution of its consitutient stars, then we can learn about stellar populations in galaxies by modelling their light by summing up individual stellar spectra for different kinds of stars. ... The data cover the wavelength range 3500 - 9000 angstroms. ... Retrieve Digital Stellar Spectra Click on the appropriate spectral type. ... Note that the designation V means main sequence, IV means subgiants, III means giants, I means supergiant. ...

... Things that I can't see, I'll touch and I'll feel then I'll kiss. Then I saw you standing there With a smile I couldn't share, Just looking around ev'rywhere. ... Just reach out and catch and hold on, Leaving trails of dust and lust, Never even ly'ng or try'ng, keep on moving, never dying. ... Smiles that I don't see, I'll make them up as I go on. ... I'll ask her for some time to go and look around; She puts the sweetness in with a sound. ... Going home, He fought for two years, never fell. ...

A special report by Katie Barnard on her work experience at Narrabri . ... I have been interested in astronomy for some time, and so I thought work experience would be a good idea to see what it was really like. ... In my time at the ATCA, I worked with Naomi McClure-Griffiths, a PhD student from the university of Minnesota. ... Naomi gave me some `cubes' (seen as movies) of different sections of the sky, from observations at Parkes, to look through and identify possible shells. ...

... AAS 225 . ... Here are a few features of the tweets from the 225th meeting of the American Astronomical Society . ... The retweet numbers are close to the values that Twitter has for the tweets, which means that I can't have messed up too much (I wouldn't expect perfect agreement since Twitter does not guarantee that any search will return all matching tweets; also, the Twitter values are updated whereas mine are fixed until the next set of tweets gets analyzed). The most re-tweeted accounts. ...

... August 30, 1999 . Looking Back on an Eclipsed Earth . ... Explanation: Here is what the Earth looks like during a solar eclipse. ... Only observers near the center of the dark circle see a total solar eclipse - others see a partial eclipse where only part of the Sun appears blocked by the Moon . This spectacular picture of the 1999 August 11 solar eclipse was one of the last ever taken from the Mir space station , as Mir is being decommissioned after more than ten years of productive use. ...

... The ancient chronical said about the colour rings around the Sun and the Moon, about three suns in the sky, light columns, bright lightning, different "comets" rushing to the Earth, moving among the stars or round the Earth with the sky. All these occurrences may be divided into three categories: one that occur in the near or far space, processes going on in the Earth atmosphere under the influence of cosmic factors and at last the occurrences connected with the Earth atmosphere. ... Rainbow . ...

Next: The Scenario Machine: Operational Up: Evolution of Magnetic Rotators Previous: Ejector-propeller hysteresis . ... The length of this segment is determined by the eccentricity. ... In this case no hysteresis occurs and transitions E -- P and the reverse take place in symmetrical points of the orbit. ... Here EP means a mixed state of the rotator at which it is in the ejector state during one part of the orbit, and in the propeller state during the rest of the orbital cycle. ...