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Flashcards in Space Vocabulary Deck (34):
1

Orbit

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

2

Solar System

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

3

Galaxy

Millions or billions of stars held together by their own gravity

4

Universe

Space and all the matter and everything in it

5

Satellite

An object that orbits a more massive object

6

Impact Crater


a round pit left behind the surface of a planet or other body in space after a smaller object strikes the surface

7

Axis of rotation

An imaginary line about which a object rotates

8

Revolution

the orbiting of an object around another object

9

Season

a period of the year determined by the position of Earth as it revolves around

10

Equinox

In an orbit, a position and time in which sunlight shines equally on the Northern and Southern Hemisphere

11

Solstice

In and orbit a position and time during which one hemisphere receives it maximum area of sunlight while the other hemisphere receives it minimum amount. The time of year when the days are both longest or shortest

12

Mare

A large dark plain of solidified lava on the moon

13

Eclipse

An event during which one object in some casts a shadow onto another

14

Umbra

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

15

Penumbra

A region of lighter shadow that may surround a dark central region. The spreading cone of lighter shadow cast by an object.

16

Astronomical Unit (AU)

Average distance from the sun which is approximately 93,000,000 miles or 150 million kilometers

17

Ellipse

An oval or flattened circle

18

Terrestrial Planets

a planet that has rocky surfaces

19

Gas Giant

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

20

Asteroid

a small solid rocky body that orbits the sun

21

Comet

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

22

Meteor

A brief streak of light produced by a particle entering Earths atmosphere at high speed

23

Geocentric

Earth centered theory of the solar system

24

Heliocentric

A sun centered theory of the solar system

25

Gravity

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

26

Tide

the rise and fall of the ocean's levels caused by the gravitational pull of the moon

27

Waxing

The gradual increase of the illuminated surface of the moon

28

Waning

(of the moon) have a progressively smaller part of its visible surface illuminated, so that it appears to decrease in size.

29

Gibbous Moon

Any moon that appears more than half lighted but less than full is called a gibbous moon

30

Crescent moon

A crescent is a thin, curved shape that's thicker in the middle and tapers to thin points at each end, like the little sliver of moon you might notice in the sky.

31

Full moon

the phase of the moon in which its whole disk is illuminated.

32

New moon

the phase of the moon when it is in conjunction with the sun and invisible from earth, or shortly thereafter when it appears as a slender crescent.

33

Quarter moon

The moon is one-half illuminated by the sun. Occurs when the moon's illumination is decreasing, Waning Crescent. The moon is less than one-half illuminated by the sun but less than one quarter illuminated.

34

Meteorite

A small object from outer space that passes through earths atmosphere and reaches the surface