Nick puts listener questions to Dr Edward Boyce. Mark Ashley asks how big Lagrange points are and asks if gravitational waves break the conservation of energy law. Max suggests a way to escape from asteroid Ianmorison using a trampoline but Edward explains that this method has some problems.

Nick puts listener questions to Dr Edward Boyce. Tom Hudson asks why we can't observe Jupiter-like extra solar planets using radio telescopes and also asks how much of the Earth's surface the Sun can illuminate at any one time. Stephen Uitti asks if the gas in galaxies forms stars during collisions. Stephen also wants to know if the interstellar medium (ISM) is replenished by stellar winds and supernovae.

Nick puts listener questions to Dr Tim O'Brien. Mike VanVooren asks how many solar systems we have beyond our own and how many planets in total. Mike also asks what would be the size of the smallest planet we could find across the vast distances of space. William Bloomfield asks if he could go straight up from the Earth and kept going, where would he go. Are there boundaries to the Universe?

Nick puts listener questions to Dr Edward Boyce. Mike Van Vooren asks which way our solar system is moving in our Galaxy and then goes on to ask if we are moving towards the nearest stars.

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