With no explanation, label each line with "product-other", "O", "other-astronomything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Photographs
taken
with
the
Hubble
Space
Telescope
in
1995
have
revealed
white
dwarf
stars
in
M4
that
are
among
the
oldest
known
stars
in
the
Milky
Way
Galaxy
at
an
age
of
13
billion
years
.
Photographs:O
taken:O
with:O
the:O
Hubble:product-other
Space:product-other
Telescope:product-other
in:O
1995:O
have:O
revealed:O
white:O
dwarf:O
stars:O
in:O
M4:other-astronomything
that:O
are:O
among:O
the:O
oldest:O
known:O
stars:O
in:O
the:O
Milky:other-astronomything
Way:other-astronomything
Galaxy:other-astronomything
at:O
an:O
age:O
of:O
13:O
billion:O
years:O
.:O