31.1 & 31.2 Flashcards
many of the names given to these groups of stars by ancient cultures remain today
constellations
collect and amplifies radio waves
radio telescope
distance light travels in one year
light year
uses a prism or diffraction grating to separate light into its component wavelengths
spectroscope
star form from a large cloud of gas, ice, and dust
nebula
section of the h-r diagram that is plotted from the upper left to the lower right and contains 90 percent of all known stars
main sequence
late stage in the stars life cycle that occurs when it hydrogen fuel is depleted, its core contracts, and its outer layers expand and cool
giant star
giant star that has lost its outer layer, leaving behind a hot, dense core that continues to contract under gravity
white dwarf
the layer of the sun that emits light into space
photo sphere
dark, cooler areas of the suns photoshpere
sunspots
area in space that is so dense that nothing can escape its pull of gravity
black hole
gigantic explosion in which the temperature within the collapsing star is 10 billion k and the atomic nuclei in the core split into neutrons and protons
supernova
when the stars explode it leaves behind a ball of neutrons
neutron stars
Where do stars form from
nebula
What does the h-r stand for in the h-r diagram
(h) Hertzsprung (r) Russel
