the state of being weightless (= not affected by the force that makes things fall to the ground): Z...
ZERO GRAVITY
the scientific study of the universe and of objects that exist naturally in space, such as the moon, the sun, planets, and stars: A...
ASTRONOMY
an occasion when the sun disappears from view, either completely or partly, while the moon is moving between it and the earth, or when the moon becomes darker while the shadow of the earth moves over it:E...
ECLIPSE
a region in space where gravity is so strong that nothing, not even light, can escape : B...
BLACK HOLE
the galaxy (= star system) that includes the earth, seen at night as a pale strip across the sky: M...
MILKY WAY
a piece of rock or other matter from space that produces a bright light as it travels through the atmosphere: M...
METEOR
the curved path through which objects in space move around a planet or star: O...
ORBIT
in or coming from a place outside the planet Earth: E...
EXTRATERRESTRIAL
a body of rock and ice that travels around the sun and that, as it nears the sun, develops a long tail of small pieces that can be seen: C...
COMET
a meteor (= a piece of rock from space that produces a bright light as it travels through the earth's atmosphere) S...
SHOOTING STAR
a device sent up into space to travel around the earth, used for collecting information or communicating by radio, television, etc.: S...
SATELLITE
(something with) a curved shape that has two narrow pointed ends, like the moon when it is less than half of a circle: C...
CRESCENT
any of the groups of stars in the sky that seem from earth to form a pattern and have been given names: C...
CONSTELLATION
the distance that light travels in one year (about 9.5 million million kilometres)
LIGHT YEAR
lit by stars or shining like a star: S...
STARRY
an object like a very large rock that goes around the sun like a planet: A...
ASTEROID
a building from which scientists can watch the planets, the stars, the weather, etc.: O...
OBSERVATORY
Related to planets: P...
PLANETARY
relating to the universe and the natural processes that happen in it: C...
COSMIC
of or from the sky or outside this world: C
CELESTIAL