Adolescence /ˌæd

moon /muːn/ noun
1. the moon
[ S ] the round object which moves in the sky around the Earth and can be seen at night
What time does the moon rise/set (= appear/disappear in the sky) ?
2. [ S or U ] the shape made by the amount of the moon that you can see at a particular time
There's no moon (= You cannot see the moon) tonight.
a crescent/full/new moon
3. [ C ] a similar round object that moves around another planet
Jupiter has at least sixteen moons.
ocean /ˈəʊ.ʃ ə n/ /ˈoʊ-/ noun
1. [ S ] a very large area of sea
These mysterious creatures live at the bottom of the ocean.
2. [ C ] used in the name of each of the world's five main areas of sea
the Atlantic/Pacific/Indian/Arctic/Antarctic Ocean
orbit /ˈɔː.bɪt/ /ˈɔːr-/ noun [ C or U ]
the curved path through which objects in space move around a planet or star
The satellite is now in a stable orbit.
Once in space, the spacecraft will go into orbit around the Earth.
outer space noun [ U ]
the part of space that is very far away from Earth
planet /ˈplæn.ɪt/ noun [ C ]
an extremely large round mass of rock and metal, such as Earth, or of gas, such as Jupiter, which moves in a circular path around the Sun or another star
the planet Earth/Venus
Might there be intelligent life on other planets?
radiation /ˌreɪ.diˈeɪ.ʃ ə n/ noun [ U ]
1. a form of energy that comes from a nuclear reaction and that can be very dangerous to health
Many servicemen suffered radiation sickness after the early atomic tests.
2. energy from heat or light that you cannot see
microwave/ultraviolet/electromagnetic radiation