Do gravitational field lines always need to be straight? Example?

[sadhu]

do gravitational field lines always need to be straight, can't they be just curves
if yes then please tell an example..?

 

[mathman]

do gravitational field lines always need to be straight, can't they be just curves
if yes then please tell an example..?

Straight lines would be from a single spherical body. More than one body would lead to curved lines.

 

[sadhu]

thanks