The Planet Quiz Show  



Short Answer:

Jupiter has the most gravity, while Mercury has the least gravity.

 
For Teachers:

The surface gravity of a planet is a function of the amount of mass (matter) that the planet possesses and the diameter or size of the planet. The diameter of the planet is a more important consideration than its mass. That is why the most massive planets, which are also the largest planets, do not possess as much surface gravity as might be expected. Jupiterís gravitational pull at its cloud tops is just over 2.5 times the surface gravity of Earth. Mercuryís gravitational pull is 37.4 percent of Earthís surface gravity while Marsís gravity, at 38 percent of Earthís gravitational pull, is a close second. Put in a more precise way, the gravitational attraction at the surface of a planet is directly related to that planetís mass and inversely related to the square of that planetís radius.

 
If your weight was 100 pounds on Earth, you would weigh the following on:
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
37
pounds
91
pounds
100
pounds
38
pounds
254
pounds*
107
pounds*
87
pounds*
114
pounds*

            *gravitational attraction measured at cloud tops



[Young's Flying Salute of the American Flag, Apollo 16]
What goes up must come down, even on Earth's moon. Astronaut John Young performs his famous flying salute of the American flag during the first EVA of Apollo 16, April 20, 1972. Notice how Youngís shadow disconnects between his boot and the lunar surface, proving that he is off the surface of the moon. A few seconds later, Young came down gently onto the moonís regolith (lunar soil). The moon has only 1/6th the force of Earthís gravity. NASA AS16-113-18340 photo...
 
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