An
Unwelcome
Place for
New Stars
This
artist's
concept
depicts a
supermassive
black hole
at the
center of
a galaxy.
NASA's
Galaxy
Evolution
Explorer
found
evidence
that black
holes --
once they
grow to a
critical
size --
stifle the
formation
of new
stars in
elliptical
galaxies.
Black
holes are
thought to
do this by
heating up
and
blasting
away the
gas that
fuels star
formation.
The blue
color here
represents
radiation
pouring
out from
material
very close
to the
black
hole. The
grayish
structure
surrounding
the black
hole,
called a
torus, is
made up of
gas and
dust.
Beyond the
torus,
only the
old
red-colored
stars that
make up
the galaxy
can be
seen.
There are
no new
stars in
the
galaxy. |