Meet Delta Cephei, A Famous Variable Star

Meet Delta Cephei, A Famous Variable Star

Delta Cephei doubles in brightness on a precise schedule, every 5.36 days. Its brightness changes are tied to its absolute brightness. Learn how this star helped establish the known distance scale of our galaxy and universe.

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How 3 Native American tribes are fighting to protect sacred land from logging, oil pipelines, and a billion-dollar telescope

Logging, oil pipelines, and scientific developments threaten lands deemed sacred by Native American tribes. The Tongass National Forest in Alaska is the country’s largest national forest, and home to three native tribes. Native Hawaiians are fighting to prote…

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