In this short film Prof. Hugo van Woerden (Univ. of Groningen, the Netherlands) explains how the distance to a hydrogen gas cloud in our Milky Way is determined from measurements of the 21 cm radio-emission that such a clouds emits. The film is Dutch spoken and subtitled in English.
This is a preview of one of the six extra features available on the DVD 'Spiral Galaxy, the Milky Way unravelled'.
For more background information on the film and on how to purchase the DVD, please visit spiralgalaxy.nl
Production & Initiative:
Produced by Lightcurve Films and DKW Film © 2009
With thanks to:
Netherlands Research School for Astronomy
Zcene Moving Media Company
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