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Flashcards in Space Deck (34):
1

Orbit

The path of an object in space as it moves around another object due to gravity

2

Tide

The rise and fall of the oceans caused by the gravitational pull of the moon and the sun

3

Solar System

The Sun and its family of orbiting planets and moons and other objects

4

Galaxy

Millions and billions of stars held together in a group by their own gravity

5

Universe

Space and all the matter and energy in it

6

Satellite

An object that orbits a more massive object

7

Impact Crater

A round pit left behind on the surface of a planet after a smaller object strikes the surface

8

Axis of Rotation

An imaginary line about which a turning body such as Earth rotates

9

Revolution

The motion of one body around another, such as the Earth in its orbit around the Sun

10

Season

One of a pattern of temperature changes and other weather trends over the course of a year

11

Equinox

In an orbit, a position and time in which Sun shines equally on both hemispheres

12

Solstice

In an orbit, a position and time during which one hemisphere receives the maximum sunlight or darkness

13

Mare

A large dark plain of solidified lava on the moon

14

Eclipse

An event during whine one object in space casts a shadow onto another

15

Umbra

The dark central region of a shadow such as the cone of complete shadow cast by an object

16

Penumbra

A region of lighter shadow that may surround a dark central region

17

Astronomical Unit

Average distance from the sun which is 93,000,000 miles

18

Ellipse

An oval or flattened circle

19

Terrestrial Planet

A planet that has a rocky surface

20

Gas Giant

A large planet that consists mostly of gases in a dense form

21

Asteroid

A small solid rocky body that orbits the sun

22

Comet

A body that produces a coma of gas and dust, a small icy body that orbits the Sun

23

Meteor

A brief stream of light produced by a particle entering Earth’s atmosphere at high speed

24

Meteorite

A small object from outer space that passes through Earth’s atmosphere and reaches the surface

25

Geocentric

Earth centered theory of the Solar System

26

Heliocentric

A sun centered theory of the universe

27

Gravity

The force that objects exert on one another because of their mass

28

Waxing

The gradual increase in the illuminated surface of the moon

29

Waning

The gradual decrease in the illuminated surface of the moon

30

Gibbous

More than half but less than fully illuminated

31

Crescent Moon

The illuminated surface is less than a quarter illuminated

32

Full Moon

The entire surface of the moon is illuminated

33

New Moon

The entire surface of the moon is not illuminated

34

Half Moon

Half of the moon is illuminated