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Its core has undergone a contraction known as "core collapse" and it has a central density cusp with an enormous number of stars surrounding what may be a central black hole. [12] Home to over 100,000 stars, [11] the cluster is notable for containing a large number of variable stars (112) and pulsars (8), including one double neutron star ...
The bulk of the cluster consisted of 160 racks of primary compute nodes, each with dual Xeon E5-2680 8-core processors, an Xeon Phi coprocessor, and 32 GB RAM. [1] The cluster also contained 16 nodes with 32 cores and 1 TB each, 128 "standard" compute nodes with Nvidia Kepler K20 GPUs, and other nodes for I/O (to a Lustre filesystem), login ...
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The first known globular cluster, now called M 22, was discovered in 1665 by Abraham Ihle, a German amateur astronomer. [4] [5] [6] The cluster Omega Centauri, easily visible in the southern sky with the naked eye, was known to ancient astronomers like Ptolemy as a star, but was reclassified as a nebula by Edmond Halley in 1677, [7] then finally as a globular cluster in the early 19th century ...
Donald W. Olson is an astrophysicist and forensic astronomer at the Texas State University. Nicknamed the "Celestial Sleuth," he is known for studying art and history using astronomical data. [ 1 ] He is currently regents professor emeritus at Texas State's Department of Physics.
When the core's mass exceeds the Chandrasekhar limit of about 1.4 M ☉, degeneracy pressure can no longer support it, and catastrophic collapse ensues. [10] The outer part of the core reaches velocities of up to 70 000 km/s (23% of the speed of light) as it collapses toward the center of the star. [11]
Texas State University comprises over 8 million gross square feet in facilities and its campuses are located on over 600 acres with an additional 4,000 acres of agriculture, research, and recreational areas. The Texas State University main campus is located in San Marcos, Texas, midway between Austin and San Antonio along Interstate 35.
She became a lecturer and then senior lecturer at the University of New South Wales, beginning in 1992 and retaining a position there as an adjunct associate professor until 2006. In the meantime, in 2002, she moved to Texas State University in 2002, as an associate professor of computer science, and was promoted to full professor in 2010.