Here's why:
* Newton's Law of Universal Gravitation: Every object in the universe attracts every other object with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
* Sun's Mass: The Sun is incredibly massive, meaning it has a strong gravitational pull.
* Earth's Motion: Earth is constantly moving, and this motion creates a balance between the Sun's gravitational pull and Earth's tendency to move in a straight line. This balance results in Earth's orbit.
If gravity were to disappear, Earth would fly off in a straight line tangent to its orbit.