Episode from the podcastThe 365 Days of Astronomy, the daily podcast of the International Year of Astronomy 2009

Guide To Space - What Are Light Echoes?

Released Friday, 28th August 2020
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https://www.youtube.com/watch?v=vyy-awQmpm4
When we look outward into space, we’re looking backwards in time. That’s because light moves, at the speed of light. It takes time for the light to reach us. But it gets even stranger than that. Light can be absorbed, reflected, and re-emitted by gas and dust, giving us a second look. They’re called light echoes, and allow astronomers another way to understand the Universe around us.

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