Next: Extragalactic Gravitational Wave Background Previous: Transparency of the Stochastic . Let the sky be observed with a detector having a pencil beam diagram across. The number of stars per frequency decade that is swept by the detector is a function of celestial coordinates (say, galactic coordinates l , b ): . ... It is clear from the figure that for an all-sky detector the Galaxy becomes transparent above the frequency  Hz. ...

... Gauging the impact of executing science program across different COS/FUV lifetime positions . ... Changing Programs & Resolving Problems . ... The first such move occurred on 23 July 2012, when the COS FUV spectrum was moved to the COS FUV Lifetime Position 2 (LP2). ... It now appears that the move to COS/FUV Lifetime Position 3 will not occur until early 2015, and so a substantial fraction of Cycle 22 observationsare likely to occur at the COS FUV lifetime position 2, prior to the change. ...

Milky Way X-ray background emission « »: , . ... RXTE , . ... Using near-infrared Galaxy intensity measured with COBE/DIRBE experiment and X-ray data from RXTE and INTEGRAL it was shown that X-ray brightness of the Galactic background emission closely follows its stellar density and can be explained by a cumulative emission of a large number of weak Galactic X-ray sources. ... Map of Galactic background emission in hard X-ray energy band obtained with INTEGRAL observatory. ... 2006, &, 452, 169 ., ...

... View on Arno from the opposite side of ponte S. Niccolo. b06. ... A view on east of Florence from the climb to piazzale Michelangelo. b10. ... Old city wall going from piazza Poggi to Forte di Belvedere. b20. ... Gate near Forte di Belvedere. b23. ... On costa San Giorgio (going down from Forte di Belvedere to palazzo Pitti). b34. ... Giardino di Boboli, stadium. c02. Palazzo Pitti; view from Giardino di Boboli. c03. ... Giardino di Boboli . ... Palazzo Pitti; view from Giardino di Boboli. c12. ...

. This artist s impression shows how photons in the cosmic microwave background (CMB) are deflected by the gravitational lensing effect of massive cosmic structures as they travel across the universe. Gravitational lensing creates tiny, additional distortions to the mottled pattern of the CMB temperature fluctuations. A small fraction of the CMB is polarized; one component of this polarized light, B-modes, have been given an additional signature by gravitational lensing. ESA/Planck Collaboration

... Bringing news from across the Universe to children all around the world . ... Galaxies are like cities of stars in the Universe. ... Dark galaxies are very far away in the Universe. They are thought to be the building blocks that helped to create the big star-filled galaxies that we see today, like our own Milky Way Galaxy. ... That s why the astronomers looked for dark galaxies around incredibly bright galaxies called quasars , which are also very far away. ...

... The region extensions added to the source list comply with the ``ASC FITS File Designers' Guide'' specifications. ... Additionally, the non-standard COVERAGE attribute is provided for order regions and the spatial background region, and the non-standard pair, COVBELOW and COVABOVE , is provided for image regions. ... There is only one extension of this kind. ... image regions . ... There is one extension of this kind for each requested order, for each selected source. order background regions . ...

... self-absorption - the absorption of light shining on an object by a process similar to that which produced the light originally; if a cloud emits less light than it absorbs from other clouds behind it, this net loss of light, termed self-absorption , causes the foreground cloud to appear darker than the background field (the term is from spectroscopy, where small absorption dips sometimes occur in larger emission lines, making the latter look as if it is absorbing part of itself) . ... HISA Main ...