How big is the moon Titan compared to the Earth? How is the gravity different between these two planetary bodies?

1 Answer
Nov 30, 2015

Around half of Earth's radius is the radius of Titan. The surface gravity of Titan is "1.353 m"//"s"^2, meaning that the gravity on Titan is about 7.3 times weaker than on Earth.

Explanation:

Size:

The radius of Earth is:
"6,371 km" or "6,371" * 10^3 "m" = "6,371,000 m"

Whereas the radius of Titan is:
"2,575.5 km" or "2,575.5" * 10^3 "m" = "2,575,500 m"

Then

Difference in Size = "Titan's Radius"/"Earth's Radius"

"2,575,500"/"6,371,000" = 0.404 ~= 0.5

Meaning about half the size of Earth's radius.

Here is a comparison of the size of Titan (in the middle) compared to that of Earth and the Moon.

Earth-Titan-MoonEarth-Titan-Moon
(from en.wikipedia.org)

Gravity:

The surface gravity on Earth is 9.807 "m/s"^2 and the surface gravity on Titan is 1.353 "m"//"s"^2

So the difference between these two gravitational bodies is around:

Difference in Gravity ="Earth's Gravity"/"Titan's Gravity"

9.807/1.353 = 7.248 ~= 7.3

Meaning that the gravity on Titan is about 7.3 times weaker than on Earth.