Mysterious moonquakes: A fresh look at Apollo-era tremors
People have long assumed that the moon is geologically dead. After all, our natural satellite lacks the internal heat needed for tectonic activity. Right? But new analysis of data recorded by seismometers during the Apollo era is shedding light on unexplained moon tremors and their origins. Could the quakes recorded…
Yes, the universe is expanding. But how fast?
Astronomers agree that the universe is growing larger, and that the rate of expansion—called the Hubble constant—is accelerating. What they don’t agree on is the best way to measure that expansion rate. Current methods have produced numbers that don’t align. But scientists are now pursuing fascinating new approaches to assess…
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