Science Has a New Way to Gauge the Universe's Expansion Rate

Cosmologists want to know how fast the universe is growing, but their data doesn't match predictions. Wendy Freedman thinks red giant stars can help.

Science Has a New Way to Gauge the Universe's Expansion Rate
Cosmologists want to know how fast the universe is growing, but their data doesn't match predictions. Wendy Freedman thinks red giant stars can help.
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