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TIMOTHY Earth Science Timothy > chapter 3 > Flashcards

chapter 3 Flashcards

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1
Q

what are telescopes that use mirrors to collect the incoming light called

A

reflectors

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2
Q

what do modern advances in telescopes design include

A

segmented mirrors
honeycombed mirrors
computer controlled mirror actuators

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3
Q

what type of telescope mont allow the viewer to follow a star with only one telescope

A

equatorial (german) mount

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4
Q

how many modern constellations are there

A

12

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5
Q

according to Bayer’s system what is the name of the brightest star in the constellation Lyra

A

Lyrae Majoris

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6
Q

what is referred to when finding a star’s location using celestial coordinates

A

celestial equator
declination
right ascention

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7
Q

besides the amount of light emmitted by a star, what else may affect a star’s apparent magnitude

A

distance from the earth

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8
Q

what is the distance that llight travels in one year

A

light year

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9
Q

what kind of galaxy is the milky way

A

spiral galaxy

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10
Q

what book of the Bible first mentions named constellations

A

Job

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11
Q

what is the mane of the structure in England noted for its huge stones arranged in a circular pattern that some believe may be a solar observatory

A

Stonehenge

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12
Q

what is the plane of the earths equator projected into the sky

A

star cluster

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13
Q

what color are the hottest stars

A

blue

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14
Q

what kind of star changes in brightness because it expands and contracts regularly

A

cepheid variable

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15
Q

what is a star that explodes and sometimes leaves behind a neutron star called

A

super nova

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16
Q

the instrument that has done more to reveal the magnificence of the heavens than any other

A

Hubble Space Telescope

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17
Q

what are several stars in a group have the same motion called

A

star cluster

18
Q

what is a group of millions of stars

A

a galaxy

19
Q

what kind of nebula can be bvserved when they block the light from more distant stars or nebulae

A

a dark nebulae

20
Q

what seem to be unusual, distance, rapidly moving objects that do not readily fit into the standard theories of the universe

A

quasars

21
Q

what are two advantages of a radio telescope

A

discover quasers

radio waves

22
Q

besides visible light, what is another kind of radiation that stars emit

A

uv rays

gamma rays

23
Q

why can the Hubble Space Telescope detect stars to fait to be seen from the earth’s surface

A

outside the atmosphere

24
Q

how do modern astronomers determine whether stars have moved

A

photographs observed over time

25
Q

define Chromatic Aberration

A

a problem with simple refracter telescopes

26
Q

define a composite telescope

A

uses both lenses and mirrors to gather light

27
Q

what is a stationary pole-like device used to determine the position and motion of the sun by the shadow it casts

A

gnomon

28
Q

what detects wavelengths other than visible light

A

radio telescope

29
Q

what was the first type of telescope invented

A

refractor telescopes

30
Q

what has the ability to bring out details in an image

A

resoultion

31
Q

what is also known as celestial latitude

A

declination

32
Q

what is the measure of the brightness of a star

A

magnitude

33
Q

what is the star’s real movement across the sky (perpendicular to the line of sight)

A

proper motion

34
Q

what is a star’s movement directly toward or away from the observer (Parallel to the line of sight)

A

radial motion

35
Q

what is a star that sometimes increases many magnitudes in brilliance for a period of time, then returns to its normal brightness

A

nova

36
Q

what galaxy contains the earth’s sun

A

milky way

37
Q

what is a large mass of dust and gasses in spacce

A

nebula

38
Q

who discovered that whight light is made up of various colors

A

Sir Isaac Newton

39
Q

which telescope has greater light-gathering ability

A

reflector

40
Q

which star has the greatest magnitude

A

the sun

41
Q

astronomers determine a star’s red shift in order to determine what

A

distance

TIMOTHY Earth Science Timothy (12 decks)

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