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  • Hey there and welcome to Life Noggin.

  • Triangle Bobert snuck into my lab and hit the big red button on the half gravity machine I told him not to go next to.

  • I probably should have made the button a little smaller.

  • That's my fault.

  • I was able to reverse everything, but it did have me thinking, what if this happened to your world?

  • What if earth only had half its gravity?

  • Well, first off, just what is gravity?

  • In general, we can define gravity as an attractive force that pulls two bodies together.

  • It's what keeps all of the planets in orbit around the sun and what keeps you from floating off into space.

  • And anything with mass has gravity.

  • The more massive something is, the greater gravitational pull.

  • So a big, massive planet like the Earth is going to pull you toward it a lot more than one of my small pizza bagels will.

  • Let me just get in here really quick.

  • Delicious.

  • Distance also matters with gravity.

  • The closer you are to something, the more gravity is going to draw you toward it,

  • and the farther away you are, the weaker the gravitational force will be.

  • Not only that, but gravity isn't even the same everywhere on Earth.

  • According to NASA and data from the Gravity Recovery and Climate Experiment,

  • gravity is ever so slightly stronger over places on Earth with higher concentrations of mass.

  • And these concentrations can even change over time.

  • But what would happen if the gravity here on Earth was suddenly cut in half?

  • It's pretty hard to tell exactly what would happen, especially since whatever would cause this sudden change would likely have other effects,

  • but if we look at the universe around us, we can get a good idea of what might happen.

  • To start off, you'd probably lose a bunch of weight.

  • That's because our weight isn't actually a constant.

  • It changes depending on where we are in the universe since it's determined by how much gravity is acting upon us.

  • For instance, if you weigh 100 Newtons on Earth, then you'd only weigh about 17 Newtons on the moon.

  • That's because up there, you'd only experience about a sixth of the gravity you normally do on Earth.

  • So with half gravity, it makes sense that you'd only probably weigh about half as much.

  • That, if you survived, and everything on Earth seemed to carry on about the same but just with half gravity,

  • there would likely be health consequences.

  • That's because your body is always working against gravity.

  • Your muscles have to work against gravity even when you're relatively still,

  • your bones have to support your weight, which is affected by gravity,

  • and even your heart has to work against gravity to pump your blood throughout your body.

  • So at half gravity, and half your weight, your heart would likely become weaker,

  • your muscles might become smaller, and you could even lose bone mass.

  • These are issues that astronauts face when experiencing weightlessness,

  • so with half your weight, it stands to reason that similar things would happen but to a lesser extent.

  • But that's if everything carried on about the same, just with half gravity.

  • If we actually suddenly lost half of the gravity on Earth, other things would probably change as a result.

  • One of those things would be escape velocity.

  • Since the Earth would have less gravity, how fast you would need to go to escape Earth,

  • otherwise known as escape velocity, would be less.

  • This means you wouldn't need to go as fast to get off this planet,

  • which might be a good idea if all this crazy gravity stuff actually happened.

  • Two tickets to Mars please!

  • I would like to chill with the aliens.

  • Let us know in the comment section below what we should talk next!

  • Curious to know what it would take for the earth to explode?

  • Check out this video.

  • It only carved out a chunk of Earth a few kilometers deep.

  • Asteroids that are bigger, denser, or made of different materials could have the ability to hit us with enough power to shatter our planet.

  • As always, my name is Blocko, this has been Life Noggin, don't forget to keep on thinking!

Hey there and welcome to Life Noggin.

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B1 US gravity earth weight escape velocity escape velocity

What If Earth Suddenly Had Half Gravity?

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    Evangeline posted on 2021/03/09
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