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Tag archives: CMB

Thwarting an alien invasion, pi in the sky, listening to the LHC and more

A guide laser

Not bright enough: this adaptive-optics laser would have to be a million times brighter to cloak the Earth. (Courtesy: ESO/G Hüdepohl)

By Hamish Johnston

Sometimes, the biggest laughs on April Fools’ Day come from the stories that read like hoaxes but are actually true. One such item is a proposal by David Kipping and Alex Teachy of Columbia University in the US, who have come up with a way of hiding the Earth from aggressive civilizations on distant planets (at least I think this is real, but I wouldn’t be surprised if it were an elaborate hoax!).


Posted in The Red Folder | Tagged , , , | 2 Comments | Permalink
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Astronomers fill supervoid in their knowledge

A cold spot in the cosmic microwave background

The cold spot (bottom right) resides in the southern galactic hemisphere. (Courtesy: ESA Planck collaboration)

By James Dacey

Astronomers believe they may finally be able to explain the origin of the “cold spot”, a  glaringly large cool region in the cosmic microwave background (CMB). Maps of the CMB, such as that created by the Wilkinson Microwave Anisotropy Probe (WMAP) and more recently by the Planck mission, reveal the distribution of radiation left over after the Big Bang. When in 2004 researchers noticed this cold spot on the map, they soon realized it was either a sign of exotic physics linked to the Big Bang itself or it was caused by some sort of structure in the foreground between the CMB and the Earth.


Posted in General | Tagged , , , , | 2 Comments | Permalink
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