This video explains how we can measure the distance to near and far objects in the universe using parallax, 'standard candles' and the Doppler effect.
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Doctor Who Confidential
Karen Gillan (aka Doctor Who's Amy Pond) visits the Royal Observatory Greenwich.
Clip from Doctor Who Confidential, Series 5 Ep. 11: Extra Time. First broadcast BBC Three, 7:30pm 12 June 2010. Used by permission.