The mutual gravitational forces that attract a planet and the sun to each other
are responsible for keeping the planet in orbit around the sun.
the shape
They all obey Kepler's 3 laws of planetary motion.
Johannes Kepler is credited with forming the mathematics of elliptical orbits.
They are in the shape of an ellipse.
There are numerous theories of planetary motion. Ptolemaeus (earth in the centre), Copernicus (the sun in the centre, planets orbit around it), Kepler (planet orbits are ellipses) all wrote such theories.
"Gravity" is responsible for the existence of planetary orbits, and for their shapes and periods. It's also the reason for the spherical shapes of the planets, and for the existence of atmospheres, in the case of those planets that have any.
because without it we would not have the same gravity or we wouldn't stay on our axis
Gravity.
Only one force - gravity.
Newton's Law of Gravity describes Planetary motion.
weight
Gravity
Gravity is completely responsible for planetary motion. The shape and size of each orbit, and the speed of the planet at every point in its orbit, taken along with the mass of the sun, are completely determined by the behavior of gravity.
Projectile motion has two components horizontal motion and vertical motion. Gravity affects only the vertical motion of projectile motion.
Isaac Newton
-- Gravity causes the vertical component of projectile motion to vary according to the local acceleration of gravity. -- Gravity has no effect at all on the horizontal component of projectile motion.
He didn't alter them. He showed that his theory of planetary motion under gravity was consistent with them.
The laws of planetary motion are attributed to Kepler.