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The Times

When you look up, how far back in time do you see?

  • Written by Michael J. I. Brown, Associate professor in astronomy, Monash University
When you look up, how far back in time do you see?Distant stars above the ruins of Sherborne Old Castle, in the UK.Flickr/Rich Grundy, CC BY-NC

Our senses are stuck in the past. There’s a flash of lightning, and then seconds pass until we hear the rumble of distant thunder. We hear the past.

We are seeing into the past too.

While sound travels about a kilometre every three seconds, light...

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