The Cosmic Glue: What is Gravity and How Does It Work?

If an object has mass, then it exerts a pull on other objects with mass. If this pull exists between all matter in the universe, then gravity is defined as the attractive force between objects. Therefore, gravity is a pulling force, not a push.

If gravity is a property of mass, and all planets and stars have mass, then those bodies must also have gravity. If we observe the Moon orbiting the Earth and the Earth orbiting the Sun, then a force must be holding them in place. Therefore, the idea that gravity only exists on Earth is false.

If we want to understand what is gravity's strength, we must first measure how much "stuff" is in an object. If the scientific term for the total amount of matter in an object is mass, then mass is the correct answer.

If gravity depends on the distance between two objects, then changing that distance changes the force. If the objects move further away, the "grip" of gravity has a longer distance to cover. If the distance increases, then the gravitational attraction decreases. Therefore, the pull gets weaker.

If the strength of gravity depends on the mass of the planet or moon you are standing on, then a smaller body will pull with less force. If the Moon is much smaller and less massive than Earth, then it will exert a smaller gravitational pull. Therefore, your weight (the measure of that pull) will be lower.

If gravity pulls on all objects equally regardless of their mass, then they should accelerate at the same rate. If there is no air resistance to slow the feather down, then nothing prevents it from falling as fast as the hammer. Therefore, in a vacuum like the Moon, they hit the ground together.

If gravity is an attractive force between two masses, it pulls from the middle of those masses. If the Earth is a giant sphere, then its gravitational pull originates from its core. Therefore, gravity pulls everything toward the Earth's center.

If the Moon has mass, then it exerts a gravitational pull on the Earth. If the Earth's oceans are liquid and can move easily, then they will bulge toward the Moon as it passes. If this bulge creates a rise and fall in water levels, then gravity is the cause of the tides.

If a moving object is caught by a sideways pull, it will move in a curve. If the Sun has a massive amount of gravity and the Earth is moving quickly, then the Sun's pull acts like an invisible tether. If this tether keeps the Earth moving in a circle, then the Sun's gravity is what maintains the orbit.

If gravity were like sound, it would need air to travel. However, if we see planets pulling on each other through millions of miles of empty space, then gravity does not need a medium. If it can travel through a vacuum, then the statement is true.

If we look at the history of science, one man is famous for seeing an apple fall and realizing the same force governs the Moon. If that man's name is Isaac Newton, then he is the correct scientist to identify.

If light travels through space and encounters an extremely massive object like a star or black hole, the space itself is curved by gravity. If the path of space is curved, then the light following that path must also bend. Therefore, gravity does affect light.

If an object has so much mass packed into a tiny space that its surface gravity becomes immense, then its escape velocity becomes higher than the speed of light. If nothing can go faster than light, then nothing can leave that object's pull. This describes a black hole.

If the universe is full of moving objects that would otherwise fly apart, then something must hold them together. If gravity provides the pull that keeps galaxies, stars, and planets in organized systems, then it acts like glue for the cosmos. Therefore, it is the force that organizes the universe.

If gravity is a property of everything that has mass, then any object made of matter has a pull. If humans, planets, sand, and stars are all made of matter, then they all have gravity. If a shadow is just a lack of light and has no mass, then it does not have gravity.

If mass is the amount of matter (atoms) inside your body, then it does not change based on your location. If you do not add or remove parts of your body, then the amount of matter stays constant. Therefore, while your weight might change on Jupiter, your mass stays the same.

If the Space Station is only 250 miles above Earth, then Earth's gravity is still 90% as strong as it is on the ground. If the station and the astronauts are falling around the Earth at the same speed, then they feel weightless because they are in "free fall." Therefore, gravity is still there; they just don't feel it.

If gravity increases as the mass of the planet increases, then a larger planet pulls harder. If Jupiter is the most massive planet in our solar system, then its gravitational pull is much stronger than Earth's. If the pull is stronger, then your measured weight would be much higher.

If gases like oxygen and nitrogen have mass, then gravity pulls on them. If there were no gravity, these gas molecules would drift away into the vacuum of space. If gravity keeps them wrapped around the planet, then it is responsible for holding our atmosphere.

If size (volume) is the same, but lead is much denser than wood, then the lead object contains more matter. If gravity depends on the amount of matter (mass), then the object with more mass has a stronger pull. Therefore, the lead object has more gravity.