 When
you celebrate your birthday, the Earth has circled the sun once from your last birthday. A
year on Earth is 365 days long but the length of a year on other planets changes with the
distance the planet is away from the sun. Here is a table of one revolution around the sun
for the nine planets.
How long it will take for each of the planets to circle around the Sun?
| Planets |
Time of revolution around the Sun |
| Mercury |
88 days |
| Venus |
224.7 days |
| Earth |
365.25 days |
| Mars |
687 days |
| Jupiter |
11.86 years |
| Saturn |
29.46 years |
| Uranus |
84.01 years |
| Neptune |
164.8 years |
| Pluto |
248.5 years |
 
A p = A e ´ 365 / T p
Where
A p = age on other planets
A e = age on Earth
T p = time of one revolution around the sun
Tom is 12 years old. What would his age be if he lived on Mercury?
From the above table, substitute in the equation.
A p = 12 x (365/88) = 49.8 years old
Linda just celebrated her 10th birthday. How old would Linda be if she were
to spend her life on Neptune?
Estimate the answer:
 Less than 1 year old
Between 1 and 5 years old
Over 5 years old
 
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