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CWRU Astronomers Find Young Galaxy Protoclusters in the Early Universe

A team of CWRU astronomers has recently identified 43 new protoclusters of galaxies, seen as they were 12 billion years in the past, when the Universe was only a few billion years old. These systems bridge the gap between the smooth early universe and the complexity of structure we see today. Barely 300,000 years after the Big Bang, the Universe was hot, dense and very nearly uniform. It had only minute density fluctuations of one part in a hundred thousand. In contrast, at the present time we see galaxies grouped together along filaments and in dense clusters containing thousands...

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A Stellar Contribution

We are always grateful for the strong support we receive from our alumni and friends. CWRU alumnus Walter Bonsack ('54) got his start in astronomy as an undergraduate, using the Burrell Schmidt (located at the time in East Cleveland) to study the chemical composition of early type stars. From there he went on to an enormously successful career studying the physics of stars, working at major astronomical observatories including those at Mt Palomar, Mt Wilson, Lowell Observatory, and Mauna Kea. Professor Bonsack and his wife Sally recently made a generous pledge to support ongoing research opportunities for CWRU physics...

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Happy Halloween 2015

Happy Halloween 2015 from CWRU Astronomy! Each year we carve astro-themed pumpkins to celebrate Halloween. This year we had starry-eyed pumpkin, M101 pumpkin, Star Wars Rebel Alliance pumpkin, and more! Check out more pictures from our annual carving event on our Facebook image gallery.

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Galaxy Recycling: the Origins of Tidal Dwarf Galaxies

In a new paper published in the research journal Astronomy & Astrophysics, an international team of astronomers led by CWRU Astronomy postdoct Federico Lelli investigate the origin, structure, and dynamics of "tidal dwarf galaxies" (TDGs). TDGs are "recycled" low-mass galaxies that form during the interaction/merger of more massive spiral galaxies. According to the standard model of cosmology, TDGs should be the only galaxies in the Universe that are not surrounded by a dark matter halo, since they form exclusively out of baryonic material (gas and stars) ejected from the disks of the more massive progenitor galaxies. Lelli and collaborators...

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