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1

It means that the hemisphere of the Moon is fully illuminated by the Sun and appears round.Neil Armstrong was the first person to walk on the Moon.The Moon's gravitational pull generates something called the tidal force. The tidal force causes the sea to bulge out on the side closest to the Moon and the side farthest from the Moon.

3

Jupiter has got 67 moons. The highest temperature on the Moon is 127°C. The lowest temperature on the Moon is -173°C. The Moon's surface has lots of craters, because it is often hit by asteroids. The first person walked on the Moon on 21st July 1969. NASA and the European Space Agency plan to send more astronauts to the Moon.

4

stages in the development of something - phaseslarge rocks that go round the Sun - asteroidsthe force that pulls two objects together - gravitygo round a planet or star - orbitrelated to the Moon in some way - lunar