Dr
Chamkaur Ghag (UCL Physics & Astronomy) explains what Uranus and
Neptune can tell us about how the other planets were formed and Dr Geraint
Jones (UCL Space & Climate Physics) looks at Triton, the largest of Neptune's
13 moons.
Watch: BBC Four 'The Sky at Night' (from 2 mins 50 secs & 24 mins
19 secs)
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