Last rays of light on Mount Kenya

You can feel the cold drifting down from the universe. At 4,300 meters, the thin atmosphere makes temperature swings rapid and extreme. It’s nearly 7 pm, and we’re watching the last light of the sun before the mercury plunges to –10°C. Above us, the Milky Way stretches across the sky, so vivid it feels as if you could reach out and touch the stars.