... October 4, 1997 . In the Center of 30 Doradus . Credit: WFPC2 , Hubble Space Telescope , NASA . Explanation: In the center of 30 Doradus lies a huge cluster of the largest, hottest, most massive stars known. The center of this cluster, known as R136 , is boxed in the upper right portion of the above picture. ... Although the ages of stars in R136 cause it to be best described as an open cluster , R136's density will likely make it a low mass globular cluster in a few billion years. ...

... October 8, 1996 . ROSAT Explores the X-Ray Sky . ... Explanation: Launched in 1990, the orbiting ROSAT observatory explored the Universe by viewing the entire sky in x-rays - photons with about 1,000 times more energy than visible light . This ROSAT survey produced the sharpest, most sensitive image of the x-ray sky to date. The all-sky image is shown with the plane of our Milky Way Galaxy running horizontally through the center. ... About APOD | ...

... A telescopic mosaic, it features well-known bright nebulae and star clusters cataloged by 18th century cosmic tourist Charles Messier. Cloud, Clusters and Comet Siding Spring . ... Then, this inbound visitor (C/2013 A1) to the inner solar system, discovered in January 2013 by Robert McNaught at Australia's Siding Spring Observatory, will pass within 132,000 kilometers of the Red Planet. M6: The Butterfly Cluster . ... Holometer: A Microscope into Space and Time . ... The Wizard Nebula . ...

. " The Arecibo Observatory is sponsored by the National Science Foundation. Any opinions, findings and conclusions or recommendations . expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation."

... Gravitational wave search provides insights into galaxy evolution and mergers . ... galaxies . ... Globular cluster NGC 2808, elliptical galaxy NGC 2986, and the Sextans Dwarf . ... Besides computer simulations, what evidence do astronomers have to support the popular hypothesis that elliptical galaxies form from merging spirals? ... When a small galaxy merges with a much more massive one, astronomers call the process a minor merger and the more massive galaxy is little affected. ...

... ALMA observatory · 260 Terabytes of data expected per year · Chile has 10% observing time Charlottsville, USA Mitaka, Japan · 4 copies of full database: Chile · Regional Center ( ARC ) user support in Europe, USA, and Japan for · proposal preparation, · data distribution · Pipeline for data reduction, resulting in fully calibrated images · Tools for spectral analysis, line fits, chemistry, radiation transfer 5 The ... 5(8) Chilean Universities & the ALMA observatory. ...

... These Frontier Fields will combine the power of HST with the natural gravitational telescopes of high-magnification clusters of galaxies. ... We are soliciting gravitational lensing maps for the last four Hubble Frontier Fields clusters (MACSJ0717.5+3745, MACSJ1149.5+2223, AbellS1063, and Abell 370) based upon the exceptionally deep HST FF imaging and other new ancillary data. ... For the full set of proposal instructions and requirements, see the FY16 Frontier Fields Lensing Map Call for Proposals....