Who
Was
Galileo
Galilei
?
Galileo
Galilei
(
February
15
,
1564
to
January
8
,
1642
)
was
an
Italian
astronomer
,
mathematician
,
physicist
,
philosopher
and
professor
who
made
observations
of
nature
.
He
also
constructed
a
telescope
and
supported
the
Copernican
theory
,
which
supports
a
sun
-
centered
solar
system
.
Galileo
was
accused
twice
of
heresy
by
the
church
for
his
beliefs
,
and
wrote
a
number
of
books
on
his
ideas
.
Galileo's
contribution
to
our
understanding
of
the
universe
was
significant
not
only
in
his
discoveries
,
but
in
the
methods
he
developed
and
the
use
of
____________________
to
prove
them
.
He
is
considered
"
The
Father
of
Modern
____________________
.
"
Telescope
In
the
fall
of
1609
he
made
the
decision
to
turn
his
telescope
toward
the
heavens
.
Using
his
telescope
to
explore
the
universe
,
Galileo
observed
the
____________________
and
found
____________________
had
phases
like
the
moon
,
proving
it
rotated
around
the
____________________
,
which
refuted
the
Aristotelian
doctrine
that
the
____________________
was
the
center
of
the
universe
.
He
also
discovered
____________________
and
its
____________________
moons
.
