Note: surface gravity (g) is very dependent on the mass and the radius of a planet. Now that we have gone over gravity, let’s finally look at the difference of gravity on Earth, versus the moon, versus Mars. If you want more information about the history of the formula, and Newton himself, you can check it out here. He came up with this theory in 1666, but it wasn’t until 1796 that a man named Henry Cavendish actually was able to prove Newton’s theory. We have all heard tales of the apple falling on Newton’s head and he came up with the theory of gravity, well this is the product of that story (the general consensus is that he had an apple tree and watched an apple fall, just not really on his head). This formula is actually Newton’s theory of Universal Gravitation. Just a refresher for the formula above, we use this formula to calculate gravity: How Do We Calculate Gravity on Earth and other planets? Again, scientists have no idea why it happens, but we at least are starting to learn more about it because of technology (which if proven, Einstein said this in 1916, or over 100 years ago). Light actually curves around a large object (like a massive galaxy). In the picture below (which was captured by the Hubble Telescope) you will see the phenomenon called gravitational lensing. While we can’t see the curvature of the universe, scientists actually can see the light being emitted from massive galaxies bend. Now, we can’t see the universe bend with the naked eye, but it is generally believed that it bends depending on mass. If smaller balls were added to the picture above then they would be pulled towards the larger because of the curve of the sheet. The other planets are pulled towards the object with the largest mass, which is the sun in our solar system. Einstein believed that the universe curved with the heaviest object in the middle, like the heavy ball. The photo above may seem super random, but scientists believe that the universe actually works like the sheet. I mean, it affects us daily in everything we do but it isn’t something we can easily define. Scientists are not quite sure just what gravity actually is. Now that you know the terms associated with gravity, the question remains of just what gravity is. The sun has more mass than the Earth, so Earth orbits the sun.Earth has more mass than the moon, so the moon orbits us.Mass is, in our case, the mutual gravitational pull between objects.You can use Newton’s theory to find the force of gravity (formula and information for that is here).The earth has a gravitational pull to our moon, which rotates around us.Basically, every planet, rock, and whatnot in the universe will attract other objects.Theory from Isaac Newton stating that every single object in the universe attracts other objects (depending on the mass).Think of gravity like this bigass objects have more gravity than smaller objects.Gravity is also what keeps us firmly on Earth so we aren’t floating around everywhere even though it could be fun.For instance, the sun has a gravitational pull for the planets in our solar system.Gravity is the force (or pull) that a planet, or object, is drawn towards another object.– Neil Armstrongīefore we continue on, it is important to define just what gravity is, and some terms associated with gravity. That’s one small step for a man, one giant leap for mankind. While we all have a lot of questions, Science Trends poses this question just what is the gravity on the moon versus the gravity on Mars, versus the gravity on Earth? Well, check out this article to learn more. Now, in 2017 the possibility of actually getting to Mars is a tangible dream, and within the next couple of decades, man will once again reach a milestone of actually being on another planet. After years of observing space through a telescope, humans were able to actually go into space, and in the 1960s we finally walked on the moon. Spanning hundreds of years in human history, people have always looked up at the stars with a fascination for what is beyond our Earth. Earth’s gravity is 9.807 m/s², compared to the moon’s gravity of 1.62 m/s² or just 17 percent of Earth’s gravity. The gravity on Mars is 3.711 m/s², which is just 38 percent the gravity on Earth. We all know that gravity is different on Mars versus the moon versus the Earth.
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