Galileo Galilei
 
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Galileo Galilei
was
 
an
astronomer,
 
physicist
 
and
engineer.
 
He
developed
telescopes
 
and
used
them
 
to
make
 
revolutionary
observations
about
our
solar system,
discovering
new
 
objects
 
like
 
the
moons
 
that
orbit
Jupiter.