This is a fundamental principle of physics. Even tiny objects like a grain of sand or a single atom have a gravitational field, although it is incredibly weak. The strength of a gravitational field depends on the object's mass and its distance from the object.

Here are some examples of objects that have gravitational fields:

* Planets: Earth, Mars, Jupiter, etc.

* Stars: Our Sun, other stars in the Milky Way, etc.

* Galaxies: The Milky Way, Andromeda, etc.

* Black holes: Extremely dense objects with incredibly strong gravitational fields.

* You and me: Even our bodies have gravitational fields, but they are so weak that we don't notice them.

Essentially, anything with mass pulls on everything else with mass, creating a gravitational field.