Insert the right article where necessary.
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.