This is a bit of a trick question! It's true that gravity pulls on objects with mass, but it's not limited to just two spheres.

Here's why:

* Gravity is universal: Every object with mass exerts a gravitational force on every other object with mass.

* Strength depends on mass and distance: The strength of this force depends on how massive the objects are and how far apart they are.

So, any two objects with mass are pulled together by gravity, even if it's a tiny force. This includes:

* The Earth and the Moon

* You and your chair

* Two dust particles floating in space

Let me know if you'd like to explore a specific example of gravitational attraction!