Where are we in the Universe?
It was only during the enlightenment that it was established that the Earth was not at the centre of the Universe. And only decades since we discovered other galaxies and of our location within the Milky Way. We have since discovered galaxy clusters, the acceleration of the expanding universe, mapped the microwave background and most recently witnessed gravitational pull among certain clusters. Assuming there is no infinity and using the inflating balloon' analogy, do we have any idea where we are located within the universe that we know exists (both visible and theorised)? Or on this level, is physical location simply an illusion?
Joanna Kerr asks astrophysicist Dr Sean McGee from the University of Birmingham...