A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
It looks like your collider is not a trigger collider. Try changing the asteroid's collider in the inspector, check "Is Trigger"
I think the message with the pencil indicates you did some changes in play mode and these changes will be lost when exiting play mode. Only...
I'm not there yet in the tutorial, I'll reply later if I have the same issue when I get there (I'm new to Unity but I'm a seasoned coder so I can...