Помогите правильно расставить артикль.
1) ___ Earth is ___ planet.
2) ___ Sun is ___ star.
3) ___ Earth moves around ___ Sun.
4) ___ galaxy is ___ large group of stars.
5) People started to travel to ___ space in the 20th century.
6) There are thousands of millions of stars in ___ Galaxy.

1) _the__ Earth is _a__ planet. 2) __the_ Sun is __a_ star. 3) _the_ Earth moves around __the_ Sun. 4) __the_ galaxy is _a__ large group of stars. 5) People started to travel to ___ space in the 20th century. 6) There are thousands of millions of stars in __the_ Galaxy.