You've likely heard the saying: Looking out into space is the same as looking back in time. But what does that mean, scientifically speaking? It turns out that astronomers can observe stars and planets as they were in the past since it takes light quite some time to travel from those distant celestial objects all the way to Earth -- and the farther an object is, the longer it takes for the light to reach us. How is that even possible? HuffPost Science's Jacqueline Howard reports.
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Talk Nerdy to Me with Jacqueline Howard, the Senior Science Correspondent for The Huffington Post.