1. The white rings of Saturn the (second A) largest planet in the (solar B) system and named (for C) the ancient Roman God of agriculture (had been seen D) by the astronomer Galileo in 1610
2. Mars is (called A) the Red Planet (beacuse B) ( its C) (reddish D) surface.
3. By (measuring A) (the B) colour of a star astronomers can tell (how C) hot (is it D)
4. In 1975, NASA (cooperate A) (with B) the Soviet Union (to achieve C) the firts international human space flight the Apollo Soyuz (Test Project D)