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Director / Editor: Victor Teboul, Ph.D.
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Independent and neutral with regard to all political and religious orientations, Tolerance.ca® aims to promote awareness of the major democratic principles on which tolerance is based.

Curious Kids: is it possible to see what is happening in distant solar systems now?

By Jacco van Loon, Astronomer, Keele University
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If a distant solar system is millions of light years away and so we see it as it was millions of years ago, how can we see what it looks like now? Parul, aged 13, Sri Ganganagar, India

What is the meaning of “now” and how does our “now” relate to the “now” somewhere else?

Nothing can travel faster than the speed of light: 300,000 kilometres per second. This means that it takes time for the light from a distant object in the universe to reach us.

Astronomers…The Conversation


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