replacing *** with 0 in ascii data file

[kinda]

hi friends.,
my ascii file is as shown
1 41.18324 117.2673 ***
2 41.18324 117.2799 12.78
3 41.18324 117.2925 ***
----------------
----------------
299859 37.65457 122.0885 16.8
299860 37.65457 122.1011 16.668
--------------------
------------------
657522 33.21582 127.602 23.532
657523 33.21582 127.6146 23.532

like wise i have 100's of files..
In all the files i have to replace the *** (represents no data in my file)
with 0( zero).
i could not match those *** with the sed. ( am unfamiliar with regexp:-( )

any suggestions plz

thanks in advance..
Yagnesh
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