Python 3, <s>25</s> 23 bytes
=
Hey I actually outgolfed someone :).

    print(("*"*9+"*\n")*10)
if stderr is valid, 22 bytes

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

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

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25 bytes answer

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

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