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Delta Cephei's hidden companion

To measure distances in the universe, astronomers use cepheids, a family of variable stars whose luminosity varies with time. Their role as distance calibrators has brought them attention from researchers ...

dateMay 12, 2015 in Astronomy
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What other worlds have we landed on?

Think of all the different horizons humans have viewed on other worlds. The dust-filled skies of Mars. The Moon's inky darkness. Titan's orange haze. These are just a small subset of the worlds that humans ...

dateJan 14, 2015 in Space Exploration
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