Statistics for Astronomical Numbers

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Hint	Number	n	% Correct
World population in 2013	7 x 10ⁿ	9	99%
US debt ceiling in 2013	US$1.67 x 10ⁿ	13	90%
Number of YouTube hits on Gangnam Style (as of Oct 2013)	1.8 x 10ⁿ	9	81%
World total GDP in 2012	US$7 x 10ⁿ	13	78%
Speed of light	3 x 10ⁿ m/s	8	78%
Age of Earth	4.54 x 10ⁿ years	9	76%
Age of Universe	1.38 x 10ⁿ years	10	73%
Global CO₂ emission in 2012	3.6 x 10ⁿ tonnes	10	71%
Number of websites in 2013	4 x 10ⁿ	9	71%
Number of insect species	6-10 x 10ⁿ	6	70%
Number of stars in Milky Way	4 x 10ⁿ	11	67%
Astronomical Unit (average Earth-Sun distance)	1.5 x 10ⁿ m	11	66%
Mole (Avogadro constant, i.e. number of atoms in 12g carbon-12)	6 x 10ⁿ	23	62%
Lightyear	9.5 x 10ⁿ m	15	60%
Number of neurons in adult's brain	1 x 10ⁿ	11	58%
Number of bacteria on Earth	5 x 10ⁿ	30	56%
Number of base pairs in human genome	3 x 10ⁿ	9	54%
Number of electrons per second in 1 Amp	6.24 x 10ⁿ	18	53%

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