Astronomical Numbers

Guess the number of zeros

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Last updated: October 12, 2013

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First submitted	October 12, 2013
Times taken	174
Average score	72.2%
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Hint	Number	n
World population in 2013	7 x 10ⁿ	9
US debt ceiling in 2013	US$1.67 x 10ⁿ	13
World total GDP in 2012	US$7 x 10ⁿ	13
Global CO₂ emission in 2012	3.6 x 10ⁿ tonnes	10
Number of websites in 2013	4 x 10ⁿ	9
Number of YouTube hits on Gangnam Style (as of Oct 2013)	1.8 x 10ⁿ	9
Number of insect species	6-10 x 10ⁿ	6
Number of bacteria on Earth	5 x 10ⁿ	30
Age of Earth	4.54 x 10ⁿ years	9
Age of Universe	1.38 x 10ⁿ years	10
Number of stars in Milky Way	4 x 10ⁿ	11
Speed of light	3 x 10ⁿ m/s	8
Astronomical Unit (average Earth-Sun distance)	1.5 x 10ⁿ m	11
Lightyear	9.5 x 10ⁿ m	15
Number of neurons in adult's brain	1 x 10ⁿ	11
Number of base pairs in human genome	3 x 10ⁿ	9
Mole (Avogadro constant, i.e. number of atoms in 12g carbon-12)	6 x 10ⁿ	23
Number of electrons per second in 1 Amp	6.24 x 10ⁿ	18

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