Earth makes lots of seismic noise, but there's one that's mysterious - a slight pulse every 26 seconds called a microseism off the coast of West Africa. What causes it? We don't know! Plus: NASA has completed its transmitter upgrades and now it can talk with Voyager 2 again!
The Earth Is Pulsating Every 26 Seconds, and Seismologists Don't Agree Why (Discover)
After months of silence, Voyager 2 sends a gleeful message back to Earth (Inverse)
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