It was Nicholas Copernicus.
who discovered that the sun keeps the planets one Their orbit.
I think this is called the Heliocentric Theory and was first discovered by Copernicus.
Gravitational attraction is proportional to mass.
None.
The gravitational attraction from our Sun holds the planets in orbit.
Ptolemey is a scientist that studied the planets and he discovered new planets in place.
The gravitational attraction between planets and the Sun is dependent on their masses and the distance between them. According to the law of universal gravitation, this attraction is stronger when the masses are larger and closer together, resulting in the planets orbiting the Sun in stable paths.
By accretion, through gravitational attraction and collision.
because of gravitational force of attraction between the earth and other planets
That force is called gravity.
The gravitational attraction by the Sun.
Planets orbit around the sun due to gravitational attraction. The sun's gravitational pull keeps the planets in their orbits, while the planets also exert a gravitational force on the sun, causing it to wobble slightly. The sun provides the heat and light necessary for the planets to sustain life.
Sir Isac Newton was the scientist who discovered why the planets stay in orbit.