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Asked by fishofdoom to Adam, Catherine, Karen, Leila, Nazim on 15 Mar 2012. This question was also asked by superscience.
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Adam Stevens answered on 15 Mar 2012:
Anything with mass will cause other things with mass to feel a force due to gravity. However, gravity is much weaker than all the other forces, so they tend not to notice. Gravity would never be able to rip apart atoms because the nuclear force is much strong, and we don’t get squished from gravity because the electromagnetic forces that hold our body (and everything else) together is much stronger too.
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Karen Masters answered on 16 Mar 2012:
All mass has gravity – the amount depends just on how much mass there is. So something twice as massive has twice as much gravity (at the same distance).
For things the size of us the gravity force is very small.
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Nazim Bharmal answered on 18 Mar 2012:
Yes, everything creates gravity, even you! But gravity is a really weak force and you need a big thing to generate a large force, like a planet, a star, or even a galaxy.
We can now build gravity detectors that are so sensitive that they can tell when a person walks into a room just based on the change in gravity, which is quite amazing.
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Leila Battison answered on 19 Mar 2012:
Absolutely everything has a force of gravity (though we don’t quite understand why yet!) and the force is proportional to its mass. So small things with small masses have gravity but it’s almost too small to detect. As things get bigger their gravity increases…
So gravity on the moon is just 15% of that on earth, which makes bouncing around quite fun for the astronauts who went there.
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