Correction for the size of Halley's Comet
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How big is 1,800,000 bushels?
It's about 0.00000002 times as big as Halley's Comet
The size of Halley's Comet is about 110,000,000,000,000.00000000000000000 bushels.
(Comet Halley, officially "1P/Halley") (volume calculated based on 2005 dimensions)
Halley's Comet, the famous comet visible to observers on Earth approximately every 76 years, has a peanut- or potato-shaped nucleus made of rock, dust, ice, and various frozen gasses. The nucleus measures approximately 15 km by 8 km by 8 km, which yields a calculated volume of 110,000,000,000,000.00000000000000000 bushels. The coma of the Comet — the trail of sublimated gasses that give the Comet its visibility — may be up to 100,000 km in length.