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The biggest known star in the universe is UY Scuti, a red supergiant star located in the constellation Scutum. It is estimated to be around 1,700 times the size of the Sun.
Observations of the largest known star, currently UY Scuti, indicate it has no companion; so it is almost certainly not being eaten by a black hole, so to speak.
No, the biggest quasar is not capable of destroying the biggest supermassive black hole. Quasars are powered by the accretion of material onto supermassive black holes, so they are closely related. The interaction between a quasar and its host black hole is complex but does not result in the destruction of the black hole.
A neutron star or a pulsar, or a black hole.
No. A black hole may be the remnant of the core of what was once a blue star, but the black hole itself is as black as anything can possibly be.
The biggest mountain outside of Earth is Olympus Mons, a giant shield volcano on Mars. It is about 13.6 miles (22 kilometers) high, making it the tallest known volcano and mountain in the entire solar system.