Dr. Universe

Ask Dr. Universe: Why is the sky blue?

RICHLAND, Wash. – Just the other day I looked up and wondered the very same thing. The sky is certainly blue, I thought. But on second thought, it isn’t always blue. Sunsets burst in pink and orange. The night sky is black.

Ask Dr. Universe: What is the Kuiper Belt?

PULLMAN, Wash. – You might say the Kuiper Belt is the frozen frontier of our solar system. Out beyond Neptune’s chilly orbit, this saucer-shaped region is home to Pluto, billions of comets, and other icy worlds.