Five PhotonsFive Photons explains what we know about the Universe through five different journeys of light across space and time. Have you ever wondered what is the most distant source of light we can see, or how a star shines? Did you know that black holes can blaze like cosmic beacons across intergalactic space, and that ancient radio waves might herald the ignition of the very first stars? Have you ever thought about what light really is? Now available in B