Space

NASA space explorer Dr Charles Elachi, who led the recent mission to Mars with a rover called Curiosity. Audio

Did the Milky Way and the Andromeda Galaxy collide about 10 billion years ago - and consequently, is our current understanding of gravity fundamentally wrong? With astronomer Hongsheng Zhao from… Audio

New Zealander Bryan Caldwell is trying to understand how our sense of taste and smell changes in space in order to design tastier foods for long-distance space missions. Audio

Foundation Professor in the School of Earth and Space Exploration, Director of the Origins Project at Arizona State University, and author of A Universe from Nothing. Audio

Cosmology consultant of the New Scientist, author of a number of books and the Solar System iPad App. Audio