Planets And Outer Space

Front 1

circling; it takes the Earth 365 days to do this around the sun

Back 1

orbit

Front 2

the ILLUSION created by the Earth's rotation and revolution that makes it appear as though the Sun and the other stars are moving around the Earth

Back 2

apparent motion

Front 3

the imaginary line that connects the North and South Poles; the Earth rotates on this

Back 3

axis

Front 4

a recognizable pattern in the stars, such as Ursa Major or Cassipeia

Back 4

constellation

Front 5

large, round holes on the surface of a moon or planet, normally created by a meteorite impact

Back 5

crater

Front 6

a very large group of stars

Back 6

galaxy

Front 7

a force that pulls two objects toward each other

Back 7

gravity

Front 8

a large rocky or metallic object from space that hits the surface of the Moon or Earth

Back 8

meteorite

Front 9

the galaxy in which our solar system is located

Back 9

Milky Way

Front 10

the northern half of the globe

Back 10

Northern Hemisphere

Front 11

the different shapes of the moon as it progresses through a one - month cycle, as seen from Earth

Back 11

phase

Front 12

the movement of an object around another object; for example, it takes the Earth one year to make one of these around the Sun

Back 12

revolution

Front 13

to travel in an orbit

Back 13

revolve

Front 14

to spin on its axis; for example, it takes the Earth one day to make one of these

Back 14

rotate/rotation

Front 15

the year-long cycle of temperature changes caused by the Earth's tilt as it revolves around the Sun

Back 15

season

Front 16

a set of planets, moons, asteroids, and comets that are held together by the gravity of a star

Back 16

solar system

Front 17

the southern half of the globe

Back 17

southern hemisphere

Front 18

a device used to magnify and see objects in space

Back 18

telescope

Front 19

the regular rise and fall of oceans caused by the Moon's gravity

Back 19

tides

Front 20

the time it takes for a planet to make one complete turn on its axis

Back 20

day

Front 21

the line where the sky and Earth's surface seem to meet

Back 21

horizon

Front 22

the time it takes for a planet to make one full trip around the sun

Back 22

year

Front 23

an object that orbits a star and does NOT shine with its own light

Back 23

Planet

Front 24

varies in sizes and made up of brightly shining gases; a huge ball of hot gases that gives off its own light

Back 24

star

Front 25

a natural object that orbits a planet; a natural satellite and is not man-made

Back 25

moon

Front 26

the four small, rocky planets closest to the sun in our solar system; Mercury, Venus, Earth, and Mars

Back 26

inner planets

Front 27

the four large, gaseous planets farthest from the sun in our solar system; Jupiter, Saturn, Uranus, and Neptune

Back 27

outer planets

Front 28

a large rock in outer space; some can be very large and some are as small as a grain of sand

Back 28

asteroid

Front 29

a star or bright object in space around which other objects orbit

Back 29

Sun