Get objects in collision

Questions & Answers
1

I need to detect if the object that has collided with my player is a bullet.
Then I can change the health and so on.

void OnCollisionEnter(Collision collision) {
	Debug.Log("Collision");
}

This works well. Is there any way I can get both objects participating in a collision?

2

The object that the script is attached to is one of the objects participating in a collision, and collision.gameObject is the other.