Reality Check
Comet Elenin will sweep nearest to Earth on Oct. 16 at a distance of 21 million miles and be moving fast enough to travel the distance from Earth to the moon in under five hours!
The effects of the comet on Earth at closest approach will be as inconsequential as that of a mosquito slamming head-on into an ocean-going supertanker.
Let's look at the physics. Comet Elenin is a loose agglomeration of volatile ices and dust a few miles across. It is therefore one hundred billionth the mass of our moon. (The relative difference is roughly the same as the mass of a mosquito vs. the mass of an oil supertanker.)
The comet will pass no closer to us than 84 times the Earth-moon distance.
Applying Isaac Newton’s laws of gravity, this means the comet's tidal pull on Earth -- at closest approach -- will be approximately one-hundred trillionth the force of the moon's tidal pull on Earth. And, we all now know that despite the dreaded Supermoon hype last week, there were no monster storms or earthquakes triggered by our satellite's gravitational tug at closest approach to Earth.
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