A large cloud of gas and dust in space

a contracting cloud of gas and dust with enough mass to form a star

the blue-white hot core of a star that is left behind after its outer layers have expanded and drifted out into space

the brilliant explosion of a dying supergiant star

the brightness of a star as seen from earth

the brightness a star would be if it were at a standard distance from Earth

a huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity

all of space and everything in it

the distance that light travels in one year

the initial explosion that resulted in the formation and expansion of the universe

a star is formed when gravity causes the gas and dust to become so dense and hot that __ occurs

how long do small-mass stars last?

how long do medium mass stars last?

how long do large mass stars last?

what determines the length of a star's life

what determines the brightness of a star?

what color are the hottest stars?

what color are the coolest stars?

what characteristic is not used to classify a star?

a spinning neutron star that gives off radio waves

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