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they are called super novas
Most do not. Stars about 10 times more massive than the sun or larger will explode. Smaller stars shed their outer layers gradually.
When smaller stars explode (like our Sun), they leave a nebula cloud by releasing their gas and they become a small but dense white dwarf star.When big stars explode (like Betelgeuse), they have a massive explosion called a supernova and the core of the star turns into a black hole or a pulsar.
They explode with nuclear explosions.
A Galaxy could not explode. An individual star can, and does, but a Galaxy consists of billions of stars quite widely separated.
They explode
Novas
No. Only the most massive stars explode.
Depends on which 5 stars
stars explode
Some stars do. They can be nova or supernova stars, depending on the scale of the explosion.
Some stars explode in a supernova.
The fate of an old star depends on its mass. Small stars will burn, essentially, forever. Medium mass stars like our Sun will eventually expand into a red giant, and collapse into a white dwarf. Very large stars will explode as supernova stars; these end up as neutron stars or if their initial mass is large enough, as black holes.
they are called super novas
Most do not. Stars about 10 times more massive than the sun or larger will explode. Smaller stars shed their outer layers gradually.
If it explodes; yes. If it just goes out, then no. Note that large stars generally all explode to some degree (the more massive, the greater the explosion). The stars that don't are the small (red) stars that last a long, long time.
black holes