[NYP] How to measure the Universe (Andrew Pontzen)

Our Universe is, at the very least, 100 billion light years – or 1,000,000,000,000,000,000,000,000,000 metres – across. But where does this number come from? How can we measure the distance to even the nearest star when we’ve never visited? And, at a time when cosmologists reckon our Universe may be just one of many in a giant multiverse, will we ever truly grasp the magnitude of what’s out there? Join us on a voyage into the farthest reaches of space and time.