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





