Gravity

Gravity
What is Gravity? Well let me tell you, gravity is a force that draws objects to planets or other bodies. Gravity is the force that keeps planets orbiting around the sun. The Earth’s gravity is what makes things fall and what keeps us to the ground. The moon is gravitationally bound to the Earth.
In 1666 at the age of 23, Isaac Newton developed the theories of gravitation. He was sitting under an Apple tree when an apple supposedly landed on his head. He wondered why the Apple fell straight to the ground rather than sideways or upwards which helped him discover his law of gravity. He then published his principle that states every body is attracted to other bodies with a force that is proportional to the product of their masses and the distance between them. 
Isaac Newton was the first to discover gravity and other scientists discovered more after him! 
Gravity is mainly based on mass but also on other aspects as well. 
Any object with a mass will have gravity but the more mass you have the more gravity will be produced.
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As shown in this picture there is a bend in space that warps around an object. Another object (the red ball) is brought into the picture. As Albert Einstein described the red ball will immediately be pulled into the bend because of the gravitational pull.
The amount of gravity that Earth has comes from its mass. You get your weight from all the Earth’s combined mass. That mass has a gravitational pull on your body mass, giving your weight. If you lived on a planet with more mass than Earth, you would weigh more but if you lived on a planet with less mass, you would weigh less.
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What causes the ocean tides? well it is the gravitational pull of the moon and ocean. The moon pulls the sea towards it causing a tide. With the same concept, stars and planets are made from gravity. Gravity pulls the materials that they are made from, creating the object.
Does gravity only pull on mass? The answer is no, Albert Einstein discovered that gravity actually pulls on light as well. Though light doesn’t have mass, it has energy and gravity affects anything that has energy.
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In this picture, the light gets redder as gravity pulls it. You can’t see the red change but scientists can measure it. That is how we know that gravity pulls light.
One may think that gravity is the same everywhere on Earth, but in reality it’s not. Areas with more underground mass, the gravity will be stronger because gravity pulls toward the most mass. With areas with less underground mass, the gravity will not be as strong. For example, if there was a small toy and a large semi-truck (not on Earth or anywhere with a large amounts of mass) the semi-truck has more mass therefore the small toy would be gravitationally bound to the the semi-truck.
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In this image, areas in blue have slightly less gravity than areas in red.
Gravity is very important to us and our universe. Without gravity, we could not live on Earth. The sun’s gravity holds us at a distance that gives off the correct amount of heat and light. Without gravity our world would fall apart.

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