Saturday, May 25, 2013

ScienceDaily: Astronomy News

ScienceDaily: Astronomy News

Cosmic swirly straws: Galaxies fed by funnels of fuel

Posted: 24 May 2013 12:48 PM PDT

Computer simulations of galaxies growing over billions of years have revealed a likely scenario for how they feed: a cosmic version of swirly straws. The results show that cold gas -- fuel for stars -- spirals into the cores of galaxies along filaments, rapidly making its way to their "guts." Once there, the gas is converted into new stars, and the galaxies bulk up in mass.

Detection of the cosmic gamma ray horizon: Measures all the light in the universe since the Big Bang

Posted: 24 May 2013 07:46 AM PDT

Radiation from all galaxies that ever existed suffuses the universe with a diffuse extragalactic background light (EBL). Measuring the EBL is as fundamental to cosmology as measuring heat from the Big Bang (cosmic microwave background) at radio wavelengths. Researchers describe the best measurement yet of the evolution of the EBL over the past 5 billion years, based on observations from radio waves to gamma rays from NASA spacecraft and ground-based telescopes.
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