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*S*T*A*R*S*

Some answers are two words, with no space in between.
Across
Longest stage in the life of a star
Color of the hottest stars
Scientists can locate this by observing the motion of a companion star
Two hydrogen nuclei fuse to form this element
Hot, ionized gas with equal positive and negative particles
When temperature increases to 10,000,000 C, in one of these, nuclear fusion leads to the birth of a star
When gravity pulling inward is balanced by fusion and radiation moving outward
Example of a main sequence star
Leftover from an old star; small, hot, dense, and dim
Causes a star in a binary system to be brighter, before it returns to normal brightness
Down
Large, cooler star that glows reddish
Large cloud of gas and dust, where stars are born
High temperature and pressure cause less massive nuclei to combine to form more massive nuclei
Color of the coolest stars
Cannot be seen, but can be located if a nearby star has matter that is swirling into it
After a supernova, the core in this becomes super small and super dense
A heavy element formed by nuclear fusion in massive stars, just before a supernova
Spinning neutron star that gives off radio waves in pulses
Small, hot, dim star
Violent explosion in a binary star system