Every object in the universe exerts a gravitational force on every other object. It's just that the force is incredibly weak unless the objects are very massive.

Here's a breakdown:

* Everything with mass exerts gravity: This includes planets, stars, galaxies, even you and me!

* The more massive an object, the stronger its gravitational pull: This is why the Earth pulls us down to its surface, while the Moon's gravity is weaker, causing tides instead of pulling us up.

* The closer objects are, the stronger the gravitational pull: This is why we are held to the Earth's surface, but not pulled towards the Sun.

So, the answer is: All objects with mass exert a gravitational force.