Except the cybercommunities or technology like things that you cant PHYSICALLY see
The correct answer is a,b and c.
a) its core becomes a white dwarf.
b) its outer layers form a nebula , or vast cloud of gas and dust.
c)its outer layers expand , and the star becomes a red giant.
-to find where you are
-to find out where you are going
-to find the direction at which you are heading
-to find alternative routes to your set destination
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I don't know sorry
Please please please I'm sorry I literally don't know
