Space Facts That Shift Perspective
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10 Space Trivia That Put the Cosmos in Perspective 1. Space is not completely
silent Space is a vacuum, so sound waves cannot propagate the way they do on Earth.
However, pressure waves exist in plasma and gas clouds. Astronomers have
detected low-frequency “sound waves” in galaxy clusters—converted into audio, they are millions
of times deeper than what humans can hear. 2. There are more stars
in the universe than grains of sand on Earth Estimates place the observable universe
at 200 billion to 2 trillion galaxies, each with billions of stars. Conservative calculations
already exceed the total number of sand grains on all Earth’s beaches combined.
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