If earth suddenly slowed down and stopped what would happen to earth

If the Sun were to suddenly disappear, Earth would travel in a perfectly straight line at 30 km/s. This is how orbits work. If the Earth's orbital velocity sped up, then it would go into a higher orbit to compensate. And if the Earth's orbital velocity slowed down, then it fall into a lower orbit to compensate. hope this helps.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

i don't know. if i were you, i would search it up online : d