Astronomy 4

Front 1

Hipparchus used triangulation to estimate the distance of the moon

T/F

Back 1

True

Front 2

The process by which a spinning object collapses and spins faster is called

Back 2

Conservation of angular momentum

Front 3

The brightness of a star at 10 parsecs is called the stars

Back 3

Absolute magnitude

Front 4

The shift of light toward the red end of the spectrum when it is near a black whole is caused by

Back 4

Gravitational redshift

Front 5

Apparent double stars are two stars going arounf each other T/F

Back 5

False

Front 6

This type of cluster has upwards of 1 million stars

Back 6

Global cluster

Front 7

Type II supernovas are white dwarf explosions T/F

Back 7

False

Front 8

A neutron star is typically about ____ across

Back 8

16km

Front 9

The star temperature classification that is just cooler than the sun is the F star T/F

Back 9

False

Front 10

This type of binary star system is detected by using the Doppler Shift

Back 10

Spectral binary

Front 11

Binary stars are used to measure

Back 11

Mass

Front 12

As core helium builds up it pushes the hydrogen into a

Back 12

Shell

Front 13

One of the best candidates for a black hole is Cygnus X-1 T/F

Back 13

True

Front 14

Using the period of bright stars and the standard candle formula you can measure distances to galaxies at the edge of the universe T/F

Back 14

False

Front 15

A white dwarf can explode from low point to low point in its cycle takes about

Back 15

11 years

Front 16

The _____ is the point between two stars that they revolve around

Back 16

Center of mass

Front 17

Stars that are forming are called

Back 17

Protostars

Front 18

Sunspots appear dark because

Back 18

They are cooler than the surrounding surface of the Sun

Front 19

The sun will ascend into the giant region of the HR diagram

Back 19

Twice

Front 20

In E=mc^2 -c stands for

Back 20

Speed of light

Front 21

A plot of temperature vs. Luminosity for stars is known as the

Back 21

HR diagram

Front 22

A singularity is the collapse of a black hole to a point T/F

Back 22

True

Front 23

The stars with the shortest main sequence lifetimes will be

Back 23

The highest mass

Front 24

The technique of combining the light from two or more smaller telescopes to obtain an image that is equivalent to that of a much larger telescope is called

Back 24

Interferometry

Front 25

The three-step process that creates energy in the sun is called the helium helium chain T/F

Back 25

False

Front 26

The earth's history shows temperature has remained stable due to constant increases in greenhouse gases T/F

Back 26

False

Front 27

A supernova type ___ is from a white dwarf explosion

Back 27

Ia

Front 28

Stars whose absorption lines move back and forth are called

Back 28

Spectroscopic binaries

Front 29

M stars have a surface temperature of about

Back 29

3000 k

Front 30

The Balmer lines in a spectrum are the signature of

Back 30

Hydrogen

Front 31

This part of the suns atmosphere is at a temperature about 1,000,000k

Back 31

Corona

Front 32

Very massive stars live relatively short lives T/F

Back 32

True

Front 33

When electrons are forced very closed together, they can stop collapse of a star. That is known as

Back 33

Electron degeneracy

Front 34

The production of heavy atoms from light atoms inside of a star is called

Back 34

Nucleosynthesis

Front 35

The process that generate energy in a white dwarf is

Back 35

Nonexistent. A white dwarf no longer generates energy

Front 36

Most stars are not on the main sequence T/F

Back 36

False

Front 37

A group of stars that is few hundred light years across and contains about 100 stars is likely a

Back 37

Stellar association

Front 38

A white dwarf can explode in a supernova if it

Back 38

Acquires enough extra mass

Front 39

The study of waves inside the sun is called

Back 39

Solar seismology

Front 40

The lower the limit for a normal star is about .1 solar masses T/F

Back 40

True

Front 41

The core of the sun moves energy primarily my convection T/F

Back 41

False

Front 42

___ of stars will lie on the main sequence

Back 42

90%

Front 43

If you know a stars temperature and use the Stefan-Boltzmann law you can find

Back 43

Luminosity

Front 44

The sun is expected to live about ___ years

Back 44

10 billion

Front 45

Absolute magnitude is the brightness of of a star in the night sky T/F

Back 45

False

Front 46

Charges accelerating along a magnetic field give off

Back 46

Synchrotron radiation

Front 47

Star A has an apparent magnitude of 5. Star B has an apparent magnitude of 3

Back 47

Answer= star b is 6.310 times brighter than star A

Front 48

The proper sequence of stages in the life of a star is

Back 48

Protostars, main sequence, red giant

Front 49

Eclipsing binaries cannot be used to measure masses of stars T/F

Back 49

False

Front 50

Stars like our sun will in the in their final phases become

Back 50

Mira variable

Front 51

A low mass star is usually less than 12 solar masses T/F

Back 51

False

Front 52

Luminosity is expressed as watts or wattage T/F

Back 52

True

Front 53

When looking at stars, the brightest are the easiest to study: this is called

Back 53

Selection effect

Front 54

A main sequence star has a luminosity class of

Back 54

A ... V

Front 55

Sunspots are a ____ storm on the sun

Back 55

Magnetic

Front 56

The curvature of space under general relatively can be caused by

Back 56

Mass

Front 57

A cloud of ejected gas surrounding a dying star is called a

Back 57

Planetary nebula

Front 58

Cepheids have pulsation periods in the range of

Back 58

1-70 days

Front 59

A flare is exactly the same as a sunspot T/F

Back 59

False

Front 60

A good analogy for magnetic waves in the solar atmosphere is similar to cracking a whip T/F

Back 60

True

Front 61

Helium core fusion in the sun will last about ___ years

Back 61

100 million

Front 62

Stars with a core temperature in excess of 20 million k probably have this hydrogen fusion type:

Back 62

CNO

Front 63

Using the Stefan-Boltzmann law to find luminosity requires

Back 63

Radius and temperature

Front 64

The baseline used in measuring the parallax of stars is

Back 64

2AU

Front 65

As the suns core heats up, the helium will begin to fuse in a process called

Back 65

Triple alpha fusion

Front 66

Small dark areas in gas clouds that may be prime stellar formation areas are called

Back 66

Bok Globules

Front 67

Mira variables have a period of about a day T/F

Back 67

False

Front 68

A recurrent nova is usually in a binary star system T/F

Back 68

True

Front 69

The hotter the star, the bluer it is. This is a consequence of

Back 69

Wiens law

Front 70

Eventually a white dwarf cools to a black dwarf T/F

Back 70

True

Front 71

Our sun will die as a white dwarf T/F

Back 71

True

Front 72

An O star is about ___ degrees surface temperature

Back 72

30,000k

Front 73

The sunspot cycle going from low point to low point in its cycle takes about

Back 73

11 years

Front 74

When a new star ejects gas in opposite directions, this is known as

Back 74

Bipolar flow

Front 75

This is an almost mass less particle that is produced in fusion

Back 75

Neutrino

Front 76

Huge plumes in the lower chromosphere of the sun following magnetic lines are called

Back 76

Prominences

Front 77

The suns source of energy is

Back 77

Fusion of hydrogen into helium

Front 78

Particles that exist in tiny energy fluctuations and are then gone are called

Back 78

Virtual particles

Front 79

Stars like our sun will leave this type of remnant after they die

Back 79

White dwarf

Front 80

The motion along the line of sight is commonly called

Back 80

Radial motion

Front 81

Large massive stars create a series of nested shells of fusion as they age T/F

Back 81

True

Front 82

The sun will become a supernova T/F

Back 82

False

Front 83

A stars first energy source comes from gravitational collapse T/F

Back 83

True

Front 84

The force that holds the nucleus of the atom together is called the

Back 84

Nuclear force

Front 85

The Pleiades are most likely an open cluster T/F

Back 85

True

Front 86

Our sun is a G star T/F

Back 86

True

Front 87

Granulation on the sun is evidence of

Back 87

Convection in the photosphere

Front 88

The nearest star to the earth is Proxima Centauri T/F

Back 88

True

Front 89

___ are small bright dead cores of stars like our sun

Back 89

White dwarfs

Front 90

Stellar computer models help us trace a stars life from birth to death T/F

Back 90

True

Front 91

If the sun were to become a black hole, the earth and other Planete would

Back 91

Continues orbiting as they do now

Front 92

Mira variable stars change their brightness by

Back 92

Molecules in cool atmosphere

Front 93

The Earth- sun distance is known as an

Back 93

Astronomical unit

Front 94

Stars that pulsate in and out are called

Back 94

Variable stars

Front 95

Stars with less than about 0.4 times the mass of the sun are probably

Back 95

Fully convective

Front 96

A technique to find diameters of stars using short exposures is called

Back 96

Speckle interferometry

Front 97

Cosmic rays are fast moving particles in space T/F

Back 97

True

Front 98

The last fusion stage in a massive star is

Back 98

Silicon to iron

Front 99

The best place to find star formation is in a

Back 99

Molecular cloud

Front 100

The total amount of energy that a star emits is called it's

Back 100

Luminosity

Front 101

The layer in a variable that star that is responsible for alternately absorbing and releasing the energy flowing from the center of the star is made up of

Back 101

Partially ionized helium

Front 102

The age of a star cluster can be determined by its turnoff point T/F

Back 102

True

Front 103

Star clusters provide a way to test stellar evolution theory because

Back 103

All the stars in a cluster are the same age and come in many different types

Front 104

The person who first started the magnitude scale for stars was

Back 104

Hipparchus

Front 105

High mass stars are those above __ solar masses

Back 105

8

Front 106

We use this to help measure the distance to variable stars

Back 106

Period luminosity

Front 107

The Chandasekhar Limit is about

Back 107

1.4 tines the mass of the sun

Front 108

40% of viable stars are binary systems T/F

Back 108

True

Front 109

Some neutron stars have periods in milliseconds T/F

Back 109

True