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Extravagant Universe, by Dr. Robert Kirshner
In Extravagant Universe: Exploding Stars, Dark Energy, and the Accelerating Cosmos, supernova expert Dr. Kirshner explains the cosmological measurements that led to an extraordinary discovery: the expansion of the universe is accelerating under the influence of a dark energy that makes space itself expand. Instead of a gravitational slowing caused by gravity, observations reveal the expansion of the universe is speeding up due to some mysterious force. It was Kirshner’s team that made this discovery.