After I typed git clone <path to project> I see that .git/refs/heads/master was created with SHA1_code inside.
Though I see that SHA1_code points to a commit object (by typing git cat-file -t SHA1_code), I couldn’t find this commit object in .git/objects.
Where is this commit object ?
It’s probably in a pack
Refer to Packfiles (Pro Git Chapter 9-4) to learn more about the git object database