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Flashcards in Space Deck (33):
1

Orbit

the circular path of an object as it revolves around another object

2

Solar system

a system of objects that revolve around a star

3

Galaxy

a group of solar systems, dust, and gas held together by gravity; our solar system is part of the Milky Way galaxy

4

Universe

everything that exists in, on and around the Earth

5

Satellite

a natural or artificial object that revolves around another object in space

6

Impact Crater

a large, circular pit in the surface of a planet or other body in space usually formed when two bodies in space collide

7

Rotation

the spinning of a celestial body, such as a planet, around an axis

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 the sun

10

Equinox

Time or date when the sun crosses

11

Solstice

either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon, marked by the longest and shortest days.

12

Mare

a type of tide that occurs when the sun, moon, and Earth are in a straight line; alignment and gravity from the moon and the sun pull the water in the same direction

13

Eclipse

an event whereby one astronomical body passes between two other astronomical bodies

14

Umbra

the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse.

15

Penumbra

the partially shaded outer region of the shadow cast by an opaque object.

16

Astronomical Unit

the mean distance from the center of the Earth to the center of the sun (about 149.6 million kilometers); used to measure distances in the solar system

17

Ellipse

a regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points (the foci) is constant, or resulting when a cone is cut by an oblique plane that does not intersect the base.

18

, Terrestrial Planet

A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals. Within the Solar System, the terrestrial planets are the inner planets closest to the Sun, i.e. Mercury, Venus, Earth, and Mars.

19

Gas Giant

a large planet of relatively low density consisting predominantly of hydrogen and helium, such as Jupiter, Saturn, Uranus, or Neptune.

20

a small rocky body orbiting the sun. Large numbers of these, ranging in size from nearly 600 miles (1,000 km) across (Ceres) to dust particles, are found (as the asteroid belt ) especially between the orbits of Mars and Jupiter, though some have more eccentric orbits, and a few pass close to the earth or enter the atmosphere as meteors.

Asteroid

21

Comet

a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.

22

Meteor,

A meteoroid is a small rocky or metallic body in outer space. Meteoroids are significantly smaller than asteroids, and range in size from small grains to one-meter-wide objects.

23

Meteorite

a meteor that survives its passage through the earth's atmosphere such that part of it strikes the ground. More than 90 percent of meteorites are of rock, while the remainder consist wholly or partly of iron and nickel.

24

Geocentric

having or representing the earth as the center, as in former astronomical systems.

25

Heliocentric

having or representing the sun as the center, as in the accepted astronomical model of the solar system.

26

Gravity

the force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.
the degree of intensity of this, measured by acceleration.

27

Tide

the alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun

28

Waxing

cover or treat (something) with wax or a similar substance, typically to polish or protect it.

29

Gibbous Moon

Any moon that appears more than half lighted but less than full is called a gibbous moon. The word gibbous comes from a root word that means hump-backed. People often see a waxing gibbous moon in the afternoon, shortly after moonrise, while it's ascending in the east as the sun is descending in the west.

30

Crescent Moon

A crescent shape is a symbol or emblem used to represent the lunar phase in the first quarter, or by extension a symbol representing the Moon itself. It is used as the astrological symbol for the Moon, and hence as the alchemical symbol for silver.

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

Occurs when the moon's illumination is increasing, First Quarter. The moon is one-half illuminated by the sun. Occurs when the moon's illumination is increasing, Waxing Gibbous