Insert the right article where necessary. is . . moves . group of stars. 5)people started to travel in the 20th century. 6)there are thousands of millions of stars in .

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.

1.the,2.the 3. -  , the.4.a,a. 5..., 6.a