... ACS Team , NASA Explanation: Stunningly detailed, this picture is a computer simulated view of a cluster of galaxies in the distant cosmos . ... Other galaxies which lie far behind the cluster are seen as numerous visible concentric arcs - lensed by the enormous gravitational field dominated by the dark matter within the cluster itself. ... Publications with keywords: Hubble space telescope - HST - arcs - galaxy cluster - gravitational lens . ... Dwarf Galaxies in the Coma Cluster . ...

M1 image More About M1 Nice Color Picture . ... M16 image More About M16 HST image . ... M31 image More About M31 Nice Color Picture . ... M42 image ; M43 image More About M42/43 Nice Color CCD Picture . M51 image More About M51 Color Image of M51 M51 Supernova . M57 image More About M57 Nice Color CCD Picture Very Deep M57 Image . ... M81 image More About M81 M81 Supernova Ultraviolet Image of M81 More about Ultraviolet Imaging . M82 image More About M82 M82 False Color M82 True Color . ...

... 2012 July 17 . Simulation: A Disk Galaxy Forms . ... U. Washington ), N-Body Shop , NASA Advanced Supercomputing . ... Green depicts (mostly) hydrogen gas in the above movie , while time is shown in billions of years since the Big Bang on the lower right. ... For our Milky Way Galaxy , however, big mergers may not be over -- recent evidence indicates that our large spiral disk Galaxy will collide and coalesce with the slightly larger Andromeda spiral disk galaxy in the next few billion years. ...

... 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. ...

This animation (MPEG 4.8 Mb) shows the motions of stars caught in the gravitational field of a three-million solar mass black hole in the core of the nearby galaxy M32 . Stars swarm around the black hole like angry bees around a hive. The animation is based on computer simulations and new Hubble Space Telescope observations of M32 . ... In 1992, Hubble observations measured a bright peak, or `cusp' of starlight that independently suggested that the stars were concentrated around a black hole. ...

Armagh Observatory, 21 December 2001: . ... The Armagh Observatory's contribution, led by as