What is a galaxy? a) all the billions of stars that exist in space b) a cluster of millions of stars in a definite pattern in space c) one or more planets orbiting around a star, similar to our sun d) a cluster of stars, planets, gas, and dust all held together by gravity

D) a cluster of stars, planets, gas, and dust all held together by gravity

image result for what happens whenever a net force acts on an object

if an object has a net force acting on it, it will accelerate. the object will speed up, slow down or change direction. an unbalanced force (net force) acting on an object changes its speed and/or direction of motion. an unbalanced force is an unopposed force that causes a change in motion.