Just like other types of stars, they can be at very different distances.
A Super Nova, exploding star, is by far the most destructive thing in the universe.
A Neutron Star
after a nova star becomes bright it turns into a dwarf and explodes.
Nova is the Latin word for "new" and Latin was the language of early modern astronomy, as of all science in medieval and Renaissance Europe. A suddenly glowing star in the night sky would be considered a "new star" or "stella nova." This eventually was shortened to "nova."
Though nova means new, nova stars really are not. A star goes through phases which vary with certain properties, the most notable being their mass.If star goes nova it brightness increases many thousands of times, occasionally many millions. Supposing the star were so far away it was invisible to us, if it increased so much in brightness it may become visible and consequently it would be 'new' to us though in fact it is probably billions of years old.
Nova. "Exploding stars" were originally called "new stars", which in Latin is "nova stellarum".
A 'nova'.
far
Super nova
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About 200 km.
No, a nova is not a star itself, but rather an astronomical event that occurs on the surface of a star. A nova is a sudden, temporary increase in brightness caused by the explosion of material on the surface of a white dwarf star.