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

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