Jupiter. However it would have to be about 10 times bigger, at least.
Yes, a dwarf planet can become a moon if it is captured by the gravitational field of a larger planet. This process can happen when a dwarf planet gets close enough to a planet and is pulled in by its gravity. Once captured, the dwarf planet would then orbit the larger planet as one of its moons.
No. Neptune is a gas giant planet. There is no way it could be reclassified as a dwarf planet.
A spiky planet is a hypothetical planet covered in tall, spiky structures that could be formed by geological processes unique to that planet. These spiky structures could be mountains, rock formations, or even crystal formations on the planet's surface.
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Yes, Eris is the largest known Dwarf Planet (but there could be larger ones that have not been discovered yet).
The sea level could have been lowered, or a volcano could have become extinct, or a coral reef could have formed, forming an archipelago and a lagoon.
Asteroids, comets, and debris in space could be remnants of a planet that never fully formed. These objects can exist in the form of planetesimals or debris left over from the early stages of a planetary system's formation. The gravitational influence of larger planets or collisions between planetesimals can prevent these remnants from coalescing into a full-fledged planet.
Mak miler
A star 'turns on' when it becomes large enough that there is enough pressure squeezing its insides to start a nuclear reaction. The pressure comes from gravity of the mass of the star. the planet Jupiter could become a star if it got significantly larger.
The Sun's pull could only lessen if its mass reduced significantly, which is unlikely, but if that happened suddenly each planet would move into an orbit which is larger and more elliptical. Its present position would be one point in the new orbit but the major axis would be larger. With a drastic reduction in mass the orbit could become hyperbolic and in that case the planet would escape from the Sun. But if the Sun's mass altered there would be other factors that would have larger consequences caused by the exact way in which the mass was changed.
Granite could become extrusive by becoming molten and then erupted onto the surface. It will then become extrusive in that it formed at or near the surface from molten material.
No planet could ever come close to the size of Betelgeuse.