Who knows. Probably billions of billions, but we will never know the total amount.
yes
Hundreds of billions of stars, some of them with planets.
About 30.
no
It makes sense to talk about the climate on other planets, not on other galaxies. Not much is known about the climate on any planet outside the Solar System.
A black hole
There are no known planets in the vicinity of a black hole.
A person who studies planets and galaxies is called an astronomer. Astronomers observe and analyze celestial bodies such as planets, stars, and galaxies to understand their composition, behavior, and evolution. They use telescopes and other instruments to gather data and make scientific discoveries about the universe.
They are unrelated.
Some stars, comets, stardust, moons, planets, have been "eaten" by a black hole. None know for sure how many of each.
NO! galaxys are many thousand times bigger than our solar system
They create a hole in the planetand just stays there!