News tagged with distance

A photon’s point of view

From a photon’s point of view, it is emitted and then instantaneously reabsorbed. This is true for a photon emitted in the core of the Sun, which might be reabsorbed after crossing a fraction of a millimetre’s distance. ...

dateAug 08, 2011 in Space Exploration
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Cosmology standard candle not so standard after all

(PhysOrg.com) -- Astronomers have turned up the first direct proof that "standard candles" used to illuminate the size of the universe, termed Cepheids, shrink in mass, making them not quite as standard as once thought. The ...

dateJan 12, 2011 in Astronomy
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App aims to make ride sharing easier

College students looking to share a ride for a weekend getaway, a trip home or a spring break vacation now have a new option from a Purdue University-affiliated startup.

dateFeb 13, 2019 in Software
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