Unit 1: Space Vocabulary Flashcards Preview

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Flashcards in Unit 1: Space Vocabulary Deck (28):
1

Universe

All existing matter and space considered as a whole; the cosmos.

2

Galaxy

A system of millions of billions of stars, together with gas and dust, held together by gravitational attraction.

3

Rotation

The action of rotating around an axis or center.

4

Revolution

Movement of the Earth around the Sun.

5

Tilted axis

The angle by which the rotational axis of the Earth differs from a right angle to the orbital plane.

6

Seasons

A period of the year characterized by particular conditions of weather, temperature, etc.

7

Barycenter

The center of mass of 2 or more bodies that are orbiting each other, or the point around which they both orbit.

8

Solstice

Either of the 2 times in the year, the summer --- and the winter --- is when the sun reaches its highest or lowest point in the sky at noon, marked by the longest and shortest days.

9

Equinox

The time or date (2x a year) at which the Sun crosses the celestial equator, when day and night are of equal, which day and night are of equal length (September 22-March 20).

10

Eclipse

Sun-Moon-Earth

11

Elliptical

Ovalish shape. The shape in which the planets orbit the Sun.

12

Perigree

The point of orbit of the moon or a satellite at which it is nearest the Earth.

13

Apogee

The point at in which the orbit of the moon or satellite at which it is farthest from the Earth.

14

Neap Tide

A tide just after the 1st or 3rd quarters of the moon when there is the least difference between high and low water. The Sun, Earth, and Mon create a 90 degree angle.

15

Spring Tide

A tide just after a new or a full moon, when there is the greatest difference between high and low tides.

16

Nutation

A change in the angle of the tilt of the Earth's axis.

17

Precession

Wobbling back and fourth of the Earth because of the Moon and Sun's gravitational pull.

18

Solar

Energy derived form the Sun's rays.

19

Solar Eclipse

Occurs when the moon passes between the Sun and the Earth.

20

Lunar Eclipse

When the Moon appears darkened as it passes into the Earth's shadow. Sun-Earth-Moon.

21

Orbit

The curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.

22

Fission

The splitting of a nucleus of an atom into nuclei of lighter atoms, accompanied by the release of energy.

23

Fusion

Th process of merging atoms together to create energy.

24

The Big Bang Theory

A theory in astronomy: the universe originated billions of years ago in an explosion from a single point nearly infinite energy density.

25

Gravitational Pull

1st described mathematically by Isaac Newton, whereby any 2 objects in the universe are attracted towards each other.

26

Electromagnetic Spectrum

The spectrum or range of wavelengths or frequencies over which electromagnetic rotation extends.

27

Photosynthesis

The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.

28

Satelite

An artificial body placed in orbit around the Earth or Moon or another planet in order to collect information or for communication.