Why are there millions and thousands of galaxies?

Why does planet earth have gravity but other planets don't?

Why do some planets have moons?

Why are there asteroids in space

Why is the sun so big?

Why does everything get pulled to the centre of the earth?

Why are there lots of stars?

Why is our moon so grey?

Why are all galaxies different colours?

Why does the milky way look like milk?

Why do stars look beautiful on earth and in space are just a

cloud of dust?

How was gravity created?