Moons, Planets and Black Holes.

12 December 2008
Presented by Dave Ansell.

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Will gravity ever pull our moon into a collision with earth? Why are planets round? How big is the black hole at the centre of our galaxy? We solve these mysteries this week on Ask the Naked Scientists. We also find out how superglue works, investigate how it is possible to have volcanoes under the sea and reveal how our years are getting longer!

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