Gravitational force was the first force to be understood scientifically. Due to gravitational force the fabric of space can bend and stretch and each object that is attracted to the sun in this galaxy has indentures as an example. If the sun was to disappear the fabric of space in which the sun sits upon would bounce back up and create ripples that would move the earth and other planets out of their orbit once the wave traveled to them.
General Relativity: The ripple that the sun disappearing would cause would travel at the speed of light. There is nothing in the universe that can travel faster than the speed of light. General relativity helps us understand things that are very large. For example, general relativity helps us understand stars and galaxies.