Python 3, 25 23 bytes

Hey I actually outgolfed someone :).

print(("*"*9+"*\n")*10)

if stderr is valid, 22 bytes

exit(("*"*9+"*\n")*10)

realised that execing didn't actually golf it down :(

25 bytes answer

exec("print('*'*10);"*10)

Works by concatenating ten copies of print('*'*10); and execing, which in turn works by concatenating '*' 10 times and printing