How to make a specific object not collide with a specific collider - 2D

Hi,

I'm pretty new to unity and even newer to 2D in unity. I have a circle collider in the center of the screen, also there are many asteroids outside of the circle and the players ship outside the circle.

The problem is that i would like player to be able to fly in and through the circle without colliding while at the same time i want asteroids to collide with it.

I was just wondering if there is any way to do this? My preferred language is c#.

Thanks in advance.