Inertia is the tendency of objects to keep moving in a straight line. They "want" to go in a straight line, so to speak. However that is changed when a force acts on them. In the case of planets, that force is the gravitational force between the planet and the Sun.
So that's why planets orbit the Sun instead of traveling in a straight line.
Kepler's Law: "The orbits of the planets are ellipses with the Sun at one of the foci."
Yes, if there were no force of the Sun's gravity, planets would travel in a straight line due to the concept of inertia, which describes an object's tendency to continue moving at a constant velocity in a straight line unless acted upon by an external force.
Nothing special.
Straight line.
no it does not
it does not
no
Yes, they do. But they sometimes travel a straight line through bent space.
idek
yes
If the force of gravity suddenly stopped acting on the planets, they would continue moving in a straight line at a constant speed, following Newton's first law of motion. Without the force of gravity to pull them towards the Sun, the planets would travel in a tangential direction away from their current orbital paths.
All bodies travel in a straight line relative relative to space-time except when influenced by gravity. Meteorites follow the same rules and travel in lines following gravity. They travel so fast that in Earth's atmosphere they tend to burn up while looking as if they are going straight. But they are following the path established by gravity.