Earth Makes A Seismic Pulse Every 26 Seconds
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!
How Do We Talk To Voyager 1 and 2 When They’re So Far Away?
The way we send those commands to Voyagers 1 and 2 is pretty basic, but with twists to make up for the extremely long distance.