31.1 & 31.2

many of the names given to these groups of stars by ancient cultures remain today

collect and amplifies radio waves

distance light travels in one year

uses a prism or diffraction grating to separate light into its component wavelengths

star form from a large cloud of gas, ice, and dust

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

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 that has lost its outer layer, leaving behind a hot, dense core that continues to contract under gravity

the layer of the sun that emits light into space

dark, cooler areas of the suns photoshpere

area in space that is so dense that nothing can escape its pull of gravity

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

when the stars explode it leaves behind a ball of neutrons

Where do stars form from

What does the h-r stand for in the h-r diagram

What is another name for our Sun

What are the inner layers of the Sun

What is the atmosphere of the Sun made up of

are sunspots hotter or cooler than the surrounding areas

are sun permanent