18 Read and complete.
1 The ancient Greeks
2 Look! 50 aliens
3 Robots
4 William Herschel
5 The astronauts
6 The Moon
almost once every month
(call) the Sun Helios
(como) out of the spaceship
(explore) Mars now to find information
(discover) Uranus tn 1781
(leave) for the Moon tomorrow
(travel) around the Earth
7 It was 1969 when Neil Armstrong
(walk) on the Moon
8 People
(use) telescopes when
they want to look at the planets​