Science Fun Facts 4

  • The moon has no atmosphere, which means it has no weather to erode the surface. Thus, the footprints left by the Apollo astronauts may endure forever.
  • The general rule of thumb is that a rocket requires a 25:1 fuel to vehicle ratio, measured by mass.
  • It is very easy to achieve orbit from the moon's surface, since there is no atmosphere and much less gravity than on earth. This is why it required a mighty Saturn V rocket to put men on the moon, but only a small rocket on the Lunar Lander to return them.
  • Some scientists have proposed using the detonation of hydrogen bombs to provide thrust for spacecraft. While this gives an excellent mass to thrust ratio, there are obviously concerns.
  • Small galaxies orbit the Milky Way, much like the moon orbits earth.
  • The moon does not actually orbit the earth; they both revolve around a common center of mass, which is about 1,000 miles out from the earth's core.
  • Water achieves maximum density at 4 degrees Celsius.
  • Salt water freezes at 28.5 degrees Fahrenheit.
  • An electromagnetic wave can not achieve infinite energy: this would cause it to have a wavelength less than Planck length, at which point the photons would cease to exist.
  • Any particle traveling back in time becomes its antiparticle. Photons are their own antiparticle, so traveling back in time has no effect on them.
  • Photons have zero rest mass, and cease to exist if they stop moving.

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