**POSTPONED** Hipparcos and Gaia: Space Astrometry: Unravelling the Formation and Evolution of our Galaxy

03 April 2020

ESA’s Hipparcos satellite measured accurate positions of some 100,000 stars. Doing so from space represented a fundamentally new discipline in space science.

In 2000 ESA adopted the Gaia mission, a vastly more advanced star-mapping satellite. Gaia was launched in 2013 and continues to operate flawlessly, measuring the positions of more than two billion stars with extreme accuracy.

The talk will review the two thousand year history of this branch of astronomy (astrometry), explain why and how these measurements are made from space, and why the measurement of star positions is of such profound scientific importance.

7:30pm

Visitors welcome £5 • Members/Students £2

Image credit: ESA-D.Ducros 2013
https://www.esa.int/ESA_Multimedia/Images/2013/08/Artist_s_impression_of...

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Michael Perryman, ESA/Gaia Project scientist 1995-2008
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