
- Light: 386,000 miles per second / 670 million miles per hour.
- Sound: 767 miles per hour at room temperature
- Acceleration of gravity: 32.16 ft./second.
- Rate of universe’s expansion: 73 kilometers (47 miles) per second per megaparsec (3.27 light years).
- Earth rotates around the sun about 30km (20 miles) per second.
- At the equator, the earth spins at 1000 miles per hour.
- The Sun orbits the galactic center at roughly 200km (130 miles) per second.
- The entire Local Group of galaxies, including the Milky Way, is hurtling toward a mysterious concentration of mass in the direction of Centaurus at more than 600km (380 miles) per second.
Jude Currivan, Cosmologist
Author, The Story of Gaia: The Big Breath and the Evolutionary Journey of Our Conscious Planet
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