Can we increase gravity on the earth by increasing its mass?

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Offline thedoc

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Joshua asked the Naked Scientists:
   
Can we increase the force of gravity on the earth by increasing its mass. Let's say by knocking asteroids into our oceans? If the above is true would the orbit of the moon be affected?

What do you think?
« Last Edit: 24/10/2014 16:30:01 by _system »

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Offline chiralSPO

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The Earth has a mass of 5.97x1024 kg. You would have to increase that by 1% (5.97x1022 kg) to get a 1% increase in the gravitational attraction to the moon. Introducing this much mass by way of meteorite impact would probably kill everything on the Earth many times over. But in theory, yes we could increase the mass of the Earth and it would change the moon's orbit.

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Offline lightarrow

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The Earth has a mass of 5.97x1024 kg. You would have to increase that by 1% (5.97x1022 kg) to get a 1% increase in the gravitational attraction to the moon. Introducing this much mass by way of meteorite impact would probably kill everything on the Earth many times over. But in theory, yes we could increase the mass of the Earth and it would change the moon's orbit.
or we could put a 100 metres large sphere of neutron star's material at the centre of Earth 😊.
I don't take responsibility for the subsequent tidal forces near that sphere, anyway 😊

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lightarrow


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Offline PmbPhy

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Quote from: chiralSPO
Introducing this much mass by way of meteorite impact would probably kill everything on the Earth many times over.
A super advanced civilization might be able to slow the asteroid down before placing it on earth. But where to put it so that it wouldn't cause a problem is a serious issue.

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Offline chiralSPO

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Perhaps an advanced civilization could use a space elevator that can convert the asteroids potential energy into useful work as it is lowered at a safe velocity...