Three things science can’t explain

  1. The moon’s orbit is off its calculated course by about six millimeters a year.
  2. The standard yardstick for length on an interplanetary scale, the Astronomical Unit, grows by about seven centimeters a year.
  3. At least four recent planetary probes experienced unaccountable changes in velocity as they passed Earth.

Now you know some of the things we don’t know.

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