Derek McComiskey asked:
From: Derek McComiskey <email@example.com>
Sent: Friday, 9 August 2013, 15:23
Subject: Contact the Naked Scientists (please do not alter this subject)
I've just been listening to this week's programme, with the piece about
mapping the milky way using parallax. This left me with two
* To observe something moving because of parallax, you need to see the movement against a more distant background. What are they using as background?
* Are there still significant risks with launches into orbit. It was made to sound so mundane!
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