Quasars Help Pinpoint the End of Reionization Epoch

<p>Using the radiation signatures of quasars, scientists have determined when the era of reionization ended in our universe – about 1.1 billion years after the Big Bang. Plus, an update on NASA’s MAVEN spacecraft, new Hubble and Chandra images, and This Week in Rocket History is the TIROS-5 weather satellite.</p>