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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