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Flashcards in Astronomy Deck (65):
1

Arctic Circle

66.5°. North, top of the globe. ( total darkness on December 21)

2

Tropic of Cancer

23.5° north June 21 sun is overhead at noon

3

Tropic of Capricorn

23.5° south December 21 sun over head at noon

4

Antarctic circle

66.5° south bottom of the globe total darkness at noon June 21

5

What do stars produce?

Light
Heat
Ultraviolet radiation

6

Blue Giants

Brightest stars

7

Red stars

Coolest stars

8

Compared to a red dwarf a white dwarf is...

Hot

9

Compared to a red dwarf a red giant is...

Bright

10

What size star is our sun

Average

11

The planets stay in orbit around the sun because of...

Ellipse

12

Jupiter is a

Jovian planet

13

The moon revolves around the earth every

27 and 1/3 days

14

Most stars appear to

Rise in the east and set in the West

15

Earth rotates every

24 hours

16

Earth revolves around the sun every

365 1/4 days

17

Longitude

Up down

18

Latitude

Side to side

19

In graphing which goes first?

Latitude then longitude

20

When the sun is highest in the sky the shadows are

Short

21

In the winter the shadows are

Long

22

Lights up and then darkens

Clockwise

23

When the moon is in between the sun and the earth the moon phase is a

New

24

What causes the moon to show phases when viewed on earth

Revolution on the moon

25

Waining then waxing

Smaller than bigger

26

The distance between the earth and the moon varies in provided by the apparent change in the moons

Diameter

27

The revolution of the moon around the earth is

The motion that causes the moon to show phases

28

The actual orbits of the planets are

Elliptical with the sun at one of the foci

29

The moon has a ******** force of gravity than the earth

Weaker

30

What’s the reason the earth revolves around the sun

Gravitational force

31

Cosmetic background information

Evidence to prove the Big Bang theory

32

Name the planets

MVEMJSUNP

33

Terrestrial planets vs Jovian planets

Inner plants are closer to each other
Inner are small dense and rocky
Outer planets are mostly gas
The outer planets are larger

34

Asteroid

Small rocky body orbiting the sun

35

Axis of rotation

Straight line through all fixed points of a rotating rigid body around which all the other points of the body move in circles

36

Comet

A celestial object consisting of a nucleus of ice and dust, when it is near the sun it has a tail that goes away from it

37

Eclipse

an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination

38

Equator

An imaginary line drawn around the earth

39

Equinox

The time or date when the sun crosses the celestial equator when day and night are of equal length (9/22-3/20)

40

Meteoroid

A small body moving in the solar system that would become a meteor if it entered earths atmosphere

41

Moon

Natural satellite of the earth visible by reflected light of the sun

42

Moon phase

The shape of the moon is the shape of the directly sunlit portion of the moon as seen by earth

43

Orbit

The curved path of a celestial object of spacecraft around a star planet or moon

44

Revolve

Move in a circle on a central axis

45

Rotate

Move or cause to move in a circle around an axis or center

46

Solar system

The collection of eight planets and their moons in orbit around the sun also including asteroids meteoroids and comets

47

Spherical

Shaped like a sphere

48

Star

Large ball of gas

49

Summer solstice

The solstice that marks the onset of summer

50

Tides

The alternative rising and falling of the sea usually twice each lunar day at a particular place

51

Winter solstice

The solstice that marks the onset of winter

52

Cosmology

The study of the origin and future of the universe

53

Big Bang Theory

States that the universe began with a tremendous explosion

54

H-R diagram

Graph showing the relationship between a stars surface temperature and its absolute magnitude

55

Main Sequence

A diagonal pattern of stars on the H-R diagram

56

White dwarf

A small hot star near the end of its life the leftover center of an old star

57

Red giant

A star that expands and cools once it is out of hydrogen and fuel

58

Supernova

The death of a large star by expansion

59

Neutron star

A star in which all the particles have become neurons the collapsed remains of supernova

60

Black hole

An object with more than 3 solar masses squeezed into a ball only 10km across, whose gravity is so strong that not even light can escape

61

Astronomical unit

The average distance between the earth and the sun, or approximately 150,000,000km

62

Terrestrial planets

The small dense rocky planets of the inner solar system

63

Jovian planets

Gas giants
The large gaseous planets of the outer solar system

64

Meteorite

A very small rocky body that revolves around the sun

65

Meteor

A streak of light caused when a meteoroid or comet, dust burns up in the Earths atmosphere before it reaches the ground