SPACE MATHEMATICS WORKSHEET 1
Astronomical Units and lightyears
Activity edited by Jonathan G. Fairman  August
1996
 Problem: An astronomicat unit (AU) is the average earthsun
distance and is 1.49598 x 10^{8} km, to six significant
figures. 1 mile = 1.61 km
 Find the earthsun distance in
miles to three significant figures.
(answer)
 For each of the following planets is given the mean
distance from the sun in kilometers. Express these distances in
AU's, using three significant figures for each
result.
(answer)
Planet Distance Distance (km x 10^{8}) (AU's)
Mercury 0.579 (.387)
Venus 1.08 (.722)
Mars 2.27 (1.52)
Jupiter 7.78 (5.20)
Saturn 14.3 (9.56)
Uranus 28.7 (19.2)
Neptune 45.0 (30.1)
Pluto 59.1 (39.5)
 The lightyear is the distance traveled by light during one
Earth year. To three significant digits, the speed of light is
3.00 x 10^{5} km/s. Find the length of the lightyear in
km's and in AU's, to 3
significant digits.
(answer)
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