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

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 kilometer every 3 seconds, light travels 300,000 kilometres every second. When we ...

January 01, 2019 at 09:00AM