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20 terms

Chapter 26 Vocab

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radio telescope
Collects and amplifies radio waves
giant
late stage of star life that occurs when hydrogen fuel is depleted
local group
cluster of about 50 galaxies including the Milky Way
Big Bang theory
all matter and energy compressed into single point that is always expanding
refracting telescope
uses convex lens to collect light
dard energy
energy that might be caused by accelerated expansion of universe
constellation
star pattern that appears to form images
dark matter
type of matter that cannot be seen and only detected by gravitational effects
photosphere
visible surface of the sun
spectroscope
Device that uses prisms or diffraction to separate light into its component wavelengths
microwave background radiation
radiation that provides evidence for an original hot expanding universe
main sequence
section of H-R diagram that is plotted from upper left to lower right
cosmology
study of how universe began
galaxy
large group of stars, dust, and gas held together by gravity
reflecting telescope
uses a mirror to collect light
Milky Way
Spiral galaxy that 100,000 light years in diameter and has 2-400 billion stars including the sun
Red shift
phenomena that the galaxy shifts to red of spectrum due to motion away from Earth
White Dwarf
Giant star that has lost its outer layers leaving behind a hot, dense core
sunspots
cool darker areas of sun's outer layer
Light-year
Distance light travels in one year