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Astronomy > Gravity, The Universe, Galaxies > Flashcards

Gravity, The Universe, Galaxies Flashcards

1
Q

the linear correlation between the rate of the expansion of the universe and distance

A

the hubble law

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2
Q

The idea that the sun, not the earth, was the center of the universe.

A

Copernican hypothesis

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3
Q

the night sky ___________ depending on where you are on earth

A

changes

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4
Q

The point directly above you

A

Zenith

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5
Q

The point below you

A

Nadir

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6
Q

constellations that never rise or set

A

circumpolar constellations

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7
Q

big bear and little bear

A

Ursa Major and Minor

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8
Q

line from north to south

A

Meridian

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9
Q

angle of a star above your horizon

A

altitude

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10
Q

An apparent shift in the position of an object when viewed from different locations

A

Parallax

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11
Q

The death of a large star by explosion

A

Supernova

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12
Q

The theory that the universe originated in a huge explosion that released all matter and energy.

A

The Big Bang Theory

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13
Q

radiation uniformly detected from every direction in space; considered a remnant of the big bang

A

Cosmic Background Radiation

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14
Q

how long does it take a zodiac sign to change

A

a month

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15
Q

Which constellation looks like a teapot?

A

Sagittarius

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16
Q

the force that attracts a body toward the center of the earth, or toward any other physical body having mass.

A

Gravity

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17
Q

the orbits of the planets around the sun are ellipses with the sun at one focus

A

Keplers 1st law

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18
Q

a line from a planet to the sun sweeps over equal areas in equal intervals of time

A

Keplers 2nd law

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19
Q

the two quantities, orbital period and semi-major axis, are related

A

Keplers 3rd law

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20
Q

what is issac newton known for?

A

Telescopes, Calculus and Physics

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21
Q

the force of gravity between two objects depends on _____ and _____

A

mass and seperation

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22
Q

Low Earth Orbit

A

LEO

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23
Q

Geostationary Orbit

A

GEO

24
Q

Sub-Orbit

A

craft does not complete orbit

25
Q

a set of gravitationally stable points related to the Earth, Sun, Moon’s mutual gravity

A

Lagrange points

26
Q

the speed needed to escape an object’s gravitational pull

A

Escape Velocity

27
Q

Why are astronauts weightless?

A

They are in free fall

28
Q

the sun ______________ as a result of the gravitational pulls of the orbits of the planets

A

wobbles

29
Q

shapes of orbits

A

circle, ellipse, parabola, hyperbola

30
Q

The gravitational attraction between masses is a result of the nearby masses; gravity has waves

A

General Relativity

31
Q

Gravitational waves are

A

ripples in the fabric of space-time

32
Q

imaginary line in the sky representing the projection of the Earth’s equator on to the celestial sphere

A

celestial equator

33
Q

imaginary points in the sky which is the projection of the north/south pole on the night sky

A

North and South Celestial Poles

34
Q

circle of ground around you

A

Horizion

35
Q

angle of star NE from N-360 degrees all around

A

Azimuth

36
Q

the motion of a body around a point outside the body

A

Revolution

37
Q

a great circle on the celestial sphere representing the sun’s apparent path during the year, so called because lunar and solar eclipses can occur only when the moon crosses it.

A

Ecliptic

38
Q

The brightness of an object depends on — and —-

A

distance and size

39
Q

the ___________ the object, the ____________ it will be

A

larger; brighter

40
Q

the absorption lines in a galaxy’s spectrum will be shifted toward redder wavelength if the galaxy is moving away from us

A

redshift

41
Q

The succession of methods by which astronomers determine the distances to celestial objects

A

Cosmic Distance Ladder

42
Q

T/F: There is a center to the expansion of the universe

A

false

43
Q

What universe is it when parallel lines converge?

A

Closed

44
Q

What universe is it when parallel lines diverge

A

open

45
Q

What universe is it when parallel lines stay parallel to each other?

A

flat

46
Q

what shape is our universe?

A

flat

47
Q

what color did our universe use to be?

A

orange

48
Q

flat, young stars are

A

disk

49
Q

puffy center with older stars

A

bulge (nucleus)

50
Q

spherical region surrounding galaxy with globular clusters

A

halo

51
Q

small spherical clusters of the oldest stars

A

globular cluster

52
Q

what creates seasons?

A

the amount of sunlight

53
Q

what is the difference in the northern and southern hemisphere

A

the sun climbs towards the south of the sky in the northern hemisphere

54
Q

what consellation looks like a hunter?

A

orion

55
Q

what constellation looks like a bull?

A

taurus

56
Q

The motion of the Sun through the Zodiac Constellations throughout the year is caused by…

A

the earths revolution

57
Q
A

Astronomy (2 decks)

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