Astronomy Talks - How do we know that the universe is expanding?

How do we know that the universe is expanding? - Hubble's greatest discoveries.It was the great 20th century astronomer Edwin Hubble who discovered the nature of the galaxies.

He then went on to make his most astounding discovery – that the farther away a galaxy is from us then the faster it is receding from us – the whole universe appears to be expanding!This has led on to our modern ideas in cosmology – the study of the universe as a whole - and the so-called ‘big-bang’ theory.

In this talk we will show how Hubble achieved all of this and discuss the evidence for a ‘big-bang’.About the LecturerOur Astronomy Talks will be brought to you by Dr Fred Stevenson.

Dr Stevenson obtained a degree in Physics with Astrophysics from the University of Leicester in 1980 followed by a PhD in Cosmology from Durham University in 1986.After further research he has spent the past twenty five years teaching adult education classes in astronomy, physics and mathematics at a variety of venues throughout Northumberland, County Durham and North Yorkshire.He has organized and taught numerous weekend courses in astronomy based in the Kielder forest park and other venues in the North Pennines.Fred is passionate about talking to the public about astronomy and has given numerous talks to astro societies and other groups.When he is not teaching Fred can be found wandering the moors and fells of the North of England and also in our Theatre bringing you these very exciting talks.