system
Given the following post, respond as if you're commenting on Reddit:
human
If there are magnetic field lines are there gravitational field lines also?

If there are what is the significance of them and how do field lines relate to the waves in electromagnetic and gravitational fields?
gpt
Yes. Similar to how magnetic field lines give some indication of which way a dipole will orient at that location and how strongly, and electric field lines indicate the direction of force a positive charge would experience, gravitational field lines indicate the strength of gravitational force a mass would experience at a particular location. 

In the case of the Earth, these gravitational field lines would point towards the center of the Earth, and converge(indicating more force) as a mass moves toward the surface.

Keep in mind these field lines are just visual depictions of the field. They aren't "real" in the way gravity is real, just representations.