#PPOD: An astronaut aboard the International Space Station photographed a sunset that looks like a vast sheet of flame. With Earth’s surface already in darkness, the setting sun, the cloud masses, and the sideways viewing angle make a powerful image of the kind that astronauts use to commemorate their flights. Credit: NASA; Caption: M. Justin Wilkinson, Texas State University

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310 | Marc Kamionkowski on Dark Energy and Cosmic Anomalies – Sean Carroll