Episode 543: What Are Light Echoes? Using Reflections Of Light To See Even Further Back In Time

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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Karla Thompson - @karlaii / https://www.youtube.com/channel/UCEItkORQYd4Wf0TpgYI_1fw

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References:

https://www.nasa.gov/feature/jpl/arecibo-radar-returns-with-asteroid-phaethon-images

https://www.nasa.gov/mission_pages/LRO/multimedia/lroimages/lroc-20100413-apollo15-LRRR.html

https://www.spacetelescope.org/videos/heic0617a/

https://www.nasa.gov/feature/jpl/light-echoes-give-clues-to-protoplanetary-disk

https://www.nasa.gov/feature/goddard/2019/nasa-s-nicer-mission-maps-light-echoes-of-new-black-hole

https://hubblesite.org/contents/news-releases/2017/news-2017-42.html

https://www.eso.org/public/images/potw1814a/

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