Suitable for teaching 11-16s. Brian Cox explains the science behind why light from stars and galaxies takes time to travel to Earth.

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Professor Brian Cox explains that light is the fastest thing in the Universe, but it’s not infinitely fast; so the further an object is from us, the further back in time we see it. He outlines that the light we see from the Sun left its surface 8 minutes ago, and the light from our nearest galaxy, Andromeda, is 2.5 million years old. The Hubble Ultra Deep Field space telescope has taken pictures of a piece of space which is so far away the light has taken 13 billion years to reach us.

This clip is from the BBC series Wonders of the Universe; a compilation of short films in which Professor Brian Cox witnesses the wonders of the universe through some of the most breath-taking environments on Earth. In the process, he reveals how the most fundamental scientific principles and laws explain not only the story of the universe, but the story of us all.

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For Class Clips users, the original reference for the clip was p011lhp0.

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Teaching Physics?

This clip could be used to initiate discussion of the vast distances involved in space travel and why this presents a problem for manned missions to even relatively close bodies such as Mars.

These clips will be relevant for teaching Physics at KS4 and GCSE in England, Wales and Northern Ireland and National 4/5 or Higher in Scotland. The topics discussed will support OCR, Edexcel, AQA, WJEC GCSE in England and Wales, CCEA GCSE in Northern Ireland and SQA National 4/5 and Higher in Scotland.

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