The History of Astronomy from the Seventeenth Century ~ Simon Allen

Since Galileo point a telescope at the night sky our knowledge of the heavens has grown exponentially.  The seventeenth century saw a mathematical understanding of planetary motion which is still used today in space missions and the first accurate measurement of the speed of light.  From this foundation we have learned how far planets, stars and galaxies are from us which have taken into the realms of how stars are born and, over the last century, how the Universe may have been created to discovering planets around other stars.

Dark matter, filaments, “dim” matter and all that! ~ Tony Baxter

Since the 1930's it has been growingly apparent that we cannot "see" all the matter in the Universe.  Tony will review the latest scientific thoughts on this enigma.