Portal:Physics/Did you know

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Mock mirage of the setting sun
  • ...that Aristotle's ideas of physics held that because an object could not move without an immediate source of energy, arrows created a vacuum behind them that pushed them through the air.
Artist's depiction of the WMAP satellite measuring the Cosmic Microwave Background Radiation to help scientists understand the Big Bang
  • ...that neutron stars are so dense that a teaspoonful (5 mL) would have ten times the mass of all human world population?
  • ...that every year, the Moon moves 3.82 cm away from Earth?
  • ...that if we travel at the speed of light it would take us no time at all to cross the universe according to our watches?
  • ...that Neptune was discovered by its gravitational pull on Uranus?


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