Galaxies & Universe
The milky way is what type of galaxy
spiral
the true brightness of a star is called?
Luminosity/absolute magnitude
when do comets form a glowing tail
as they approach the sun the heat vaporizes it
The force that holds a galaxy together
gravity
if a galaxy is red-shifted that means it is moving _______ from earth
AWAY
starlight provides scientist with information about the stars what????
composition, temperature
Where do short term comets originate from what region of our solar system
Kuiper Belt
a depression formed when a meteorite hits earth
impact crater
which type of galaxy contains red and old stars
elliptical
how do astronomers divide the night sky to study it
by constellations
meteoroid
What is the name of the energy that scientist believe are pushing galaxies apart
dark energy
Name the area in the center of a spiral galaxy where the arms extend from ...
central bulge
Name the device that divides light into different wavelengths
spectroscope
chunks of rock and ice that orbit the Sun between Mars and Jupiter
asteroids
Name the theory that states that the universe began from a single point billions of years ago and is still expanding
Big bang theory
90 percent of the universe is composed of
dark matter
a stars luminosity does not depend on the stars
a. size b. Temperature c. apparent magnitude
apparent magnitude
When a wavelength shifts to a different wavelength, the shift is called ____________
Doppler shift
Name the star directly above the North Pole
Polaris