Stars
Protostars become stars when...
fusion begins in their cores
Which part of the Milky Way galaxy is our solar system found?
in the spiral arm
Astronomers use _____ to divide the night sky.
Constellations
The Big Bang theory states that...
the universe began from a single point
A ____ is an explosion of a massive star
supernova
Gases given off in a supernova can do what?
Become new stars and planets by being recycled.
a galaxy with arms radiating from the central bulge
spiral
Spectroscopes DO NOT provide information to scientist about a stars ______.
the distance between the sun and earth
astronomical unit
An object whose gravity is so great no light can escape...
black hole
The hot, dense, carbon core of a low-mass star becomes a...
White Dwarf
a group of stars (or galaxy) that includes the sun
the Milky Way
How do astronomers recognize regions in the night sky?
Constellations
the brightness of a star or other object in space as it appears on earth
apparent magnitude
a _______ is a small, very dense neutron core that remains after a massive star explodes.
neutron star
The light emitted by a star is NOT related to a star's...
number of layers
a group of stars that contains very little gas and dust, but has many older stars
elliptical galaxy
Scientist use a Hertsprung-Russell diagram to...
graph and classify stars
The Big Bang theory states that....
the universe began from a single point billions of years ago
Spectroscopes provide information to scientist about a stars ______.
temperature & composition
What is the correct order of the major steps in star formation...
nebula forms - nebula collapses -
protostar forms - fusion begins
this groups of stars shape is based on the gravitational pull of neighboring galaxies
irregular
Scientist do NOT use what to classify stars?
location
the true brightness of any object in space
luminosity
What is used to measure the distance between stars
light year