15 Read and complete.
1 The ancient Greeks
2 Look 50 oliens
3 Robots
4 William Herschel
5 The astronauts
6 The Moon
olmost once every month.
7 it was 1969 when Neil Armstrong
(walk) on the Moon.
8 People
They want to look at the planets.
(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
(use) telescopes when
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