Would you like to travel TO space? If so, you have to choose where IN? It is difficult to imagine that there are about 20 stars FOR each of human being ON our planet. A group OF stars is called a galaxy. It will take FROM you 100.000 years to travel FROM one edge of it TO the over (Я думаю, здесь other, а не over). But people hope they will travel THROUGH space ON huge starships far FROM the Earth.

Я не очень хорошо разбираюсь в предлогах, если честно. Может кто-то подправит?
(сделала НЕ ЗА СИМПЫ) ;)

Would you like to travel IN space? If so, you have to choose where TO? It is difficult to imagine that there are about 20 stars FOR each of human being ON our planet. A group OF stars is called a galaxy. It will take you 100.000 years to travel FROM one edge of it TO the other. But people hope they will travel THROUGH space IN huge starships far FROM the Earth.

Вот чуточку подправила.

там где говорится про 100 звезд, я не поставила ничего.
travel IN space - путеш. в космосе
where TO - куда
IN huge - в кораблях