Q&A: General Astronomy and Space Science
My friend believes that the universe is only 6000 years old.
As proof of this he says the rotation of the Earth is slowing
one second a day. If you add one second a day for every day
from today back to the dinosaurs, the rotation would be so
fast the dinosaurs would not survive. Is the Earth really
slowing? If so, how does science disprove the rest of this
The length of the day varies for many reasons -- ocean tides,
atmospheric circulation, internal effects, which are cyclical
or random, and the transfer of angular momentum to the Moon's
orbital motion, which causes the length of the day to
increase by about 1.5 - 2 milliseconds per century.
Extrapolating back to the time of the dinosaurs about 100
million years ago, the length of the day would have been
about 2000 seconds shorter. Still plenty of time for a
dinosaur to find a meal and get a good night's sleep, I would