Question

what would happen to the orbits of the planets if the suns gravity suddenly disappeared?
they would fall into the sun
they would continue in their current orbits
they would collide with each other
they would move in straight lines

Explanation:

The Sun's gravity keeps planets in their orbits. Without it (if the Sun suddenly disappeared), there's no centripetal force. According to Newton's first law (an object in motion stays in motion with constant velocity unless acted on by a force), planets would move in straight - line paths (as they were moving tangentially to their orbits at the moment the Sun disappeared).

Answer:

They would move in straight lines.