Maps from the European Space Agency’s Planck satellite reveal the cosmos in a range of microwave and infrared frequencies.
Planck’s primary mission was to precisely measure the cosmic microwave background, or CMB,
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, which is 13.8-billion-year-old radiation that allows astronomers to probe the universe’s first moments (SN: 12/28/13, p. 21). The CMB appears as speckles; blue regions are slightly colder than the average CMB temperature of 2.7 kelvins, while orange ones are warmer.
To study these tiny fluctuations,
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, scientists must filter out galactic radiation emitted by speedy electrons (red at lower frequencies) and dust grains (red and white at higher frequencies).
“From the standpoint of the CMB, all this foreground stuff is like bugs on a windshield,
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,” says Planck project scientist Charles Lawrence. “But entomology is an interesting subject.”
Magazine In the Jan. 21 SN: Supercontinent superpuzzle,
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, quantum weirdness confirmed and more. Current Issue PLANETARY PROTECTION Earth’s magnetic field deflects charged solar particles toward the planet’s poles, generating auroras. This photo was taken from (and shows parts of) the International Space Station. EMail Google+ Above: NASA; Below,
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, from top: NASA, JHUAPL, Carnegie Inst. for Science; JPL-Caltech/NASA; NASA; JPL-Caltech/NASA A powerful global magnetic field envelops Earth in a cozy blanket of protection against bursts of solar particles (see " The magnetic mystery at the center of the Earth "). But the solar system’s other rocky worlds aren’t so lucky. Mercury: Paltry The most petite planet has an appropriately puny magnetic field,
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, just 1.1 percent as strong as Earth’s ( SN Online: 5/7/15 ). This article is available only to subscribing members. | 202.785.2255 |

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