Astronomy Test #4 Review

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ASTR-1030 Final

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Astronomy Test #4 Review


Astronomy Test #4 ReviewVersion en ligne ASTR-1030 Final par Naomi Pham 1 From the beginning, how long can a star like the Sun keep burning hydrogen in its core? a 10,000 years b 10 billion years c 200 billion years d 1 million years 2 What are the reddish clouds of gas around the stars in this image? a a supernova b a planetary nebula c a reflection nebula d an emission nebula 3 Use the H-R diagram. Where are the brightest stars? a Y b U c X d T 4 Use the H-R diagram. The location of the most massive main sequence stars is a T b Z c W d V 5 Use the H-R diagram. The location of the coolest stars is a W b Z c T d V 6 Use the H-R diagram. The location of the smallest size stars is a V b S c Z d W 7 Use the H-R diagram. The location of the giant stars on this diagram is a U b W c S d X 8 A star is found to have a parallax of 0.5 arc-seconds. What is the distance to this star? a 1 parsec b 4 light years c 10 parsecs d 2 parsecs 9 The beautiful object shown on this image is the envelope of a Sun-like star as it finally runs out of fuel. It is a a planetary nebula b a nova explosion c a supernova explosion d a red giant star 10 What is the object at the center of this image? a a high mass main sequence star b a supernova c a white dwarf d a neutron star 11 Which star will spend the shortest time on the main sequence? a 0.5 Msun b 1.0 Msun c 2.0 Msun d 4.0 Msun e 8.0 Msun 12 What is one characteristic of a pulsar? a low temperature b large magnetic field c large size d gravity so strong that light cannot escape 13 A neutron star is about the same size as a the Sun b a US city c the Earth d the Moon 14 What are the large, black marks seen on the Sun in this image? a Mercury transits b solar flares c Sunspots d a total eclipse 15 Sirius is about 2 times the temperature of the Sun and about the same size. The luminosity of Sirius compared to the Sun is a 4 times larger than Lsun b 32 times larger than Lsun c 16 times larger than Lsun d 100 times larger than Lsun 16 Stellar spectral types (O, B, A, F, G, K, M) represent a sequence of changing a temperatures b absolute magnitudes c chemical compositions d pressures 17 Compared to a star in the middle of the H-R diagram, a star in the lower left part of the diagram is a smaller and fainter b larger and fainter c hotter and brighter d larger and cooler 18 The interstellar medium is made up of matter in the form of a hydrogen and dust b oxygen and carbon c hydrogen and iron d water and ices 19 What is the distance to a star with an apparent magnitude of +7 and an absolute magnitude of +5? a 100 pc b 25 pc c 40 pc d 1000 light years 20 Star clusters help us to learn about the evolution of stars because stars in a cluster are a about the same temperature b about the same mass c about the same spectral type d about the same age 21 The best place to search for black holes is in a region of space that a has strong x-ray emission b is dark and empty c is cooler than its surroundings d has recently lost some stars 22 Measurements show a certain star has a very low luminosity (0.0001 times the Sun's) while its temperature is quite hot (20,000 K). How can this be? a it must be quite small in size b it must be a main sequence star c it must be quite large in size d it must be a brown dwarf and not a regular star 23 What critical event must occur in order for a protostar to become a main sequence star? a the cloud reaches a certain size b nuclear reactions begin in the core c the cloud forms planets around it d the protostar first becomes small and cold 24 While a star is on the main sequence, what is the primary nuclear reaction in the core? a hydrogen --> uranium + energy b helium + energy --> hydrogen c helium --> carbon +energy d hydrogen --> helium + energy 25 For a massive star, what is the final object left behind in the image above a planetary nebula b white dwarf c red supergiant d neutron star 26 Red giants are more luminous than white dwarfs because a red giants are hotter b red giants are closer c red giants are larger d red giants are denser e all of the above 27 What is the significance of the Turn-Off point for a star cluster? a it tells which stars might be binary stars b it tells the composition of the star cluster c it tells the position of the star cluster d it tells the age of the star cluster 28 Stellar parallax measurements are used in astronomy to determine which one of the following properties of stars? a colors b distances c speeds d temperatures e compositions 29 Two stars have the same luminosity. Star B is three times farther away than Star A. Compared to star A, Star B will look a 9 times fainter b 3 times brighter c 9 times brighter d 50 times brighter e both will look equally bright 30 Heavy elements up to and including iron, but not heavier than iron, are made in a the center of high mass stars b nebulae c supernova explosions d black holes 31 What is a characteristic of a black hole? a they are invisible and can never be detected by astronomers b they only appear in starless, dark areas of the Milky Way c they suck in planets and stars, no matter where they are d they have a radius (size) that depends on their mass 32 The star Rigel has a luminosity of 100,000 Suns and the star Altair has a luminosity of 100 suns. If both stars are on the main sequences, then it follows that a Rigel is smaller than Altair b Rigel is fainter than Altair c Rigel is hotter than Altair d Rigel is closer than Altair 33 Which of the following objects has the lowest overall density? a neutron stars b red supergiants c main sequence stars d white dwarfs e black holes 34 What is phase 1 in the diagram? a red giant b main sequence c white dwarf d planetary nebula e He --> carbon reactions 35 What is phase 2 in the diagram? a red giant b main sequence c white dwarf d planetary nebula e He --> carbon reactions 36 What is phase 3 in the diagram? a red giant b main sequence c white dwarf d planetary nebula e He --> carbon reactions 37 What is phase 4 in the diagram? a red giant b main sequence c white dwarf d planetary nebula e He --> carbon reactions 38 What is phase 5 in the diagram? a red giant b main sequence c white dwarf d planetary nebula e He --> carbon reactions 39 The Sun will get dimmer as it begins to run out of hydrogen fuel in its core. a True b False 40 Most known star masses have been determined from observations of binary star systems. a True b False

Astronomy Test #4 Review

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Astronomy Test #4 ReviewVersion en ligne

par Naomi Pham

From the beginning, how long can a star like the Sun keep burning hydrogen in its core?

What are the reddish clouds of gas around the stars in this image?

Use the H-R diagram. Where are the brightest stars?

Use the H-R diagram. The location of the most massive main sequence stars is

Use the H-R diagram. The location of the coolest stars is

Use the H-R diagram. The location of the smallest size stars is

Use the H-R diagram. The location of the giant stars on this diagram is

A star is found to have a parallax of 0.5 arc-seconds. What is the distance to this star?

The beautiful object shown on this image is the envelope of a Sun-like star as it finally runs out of fuel. It is

What is the object at the center of this image?

Which star will spend the shortest time on the main sequence?

What is one characteristic of a pulsar?

A neutron star is about the same size as

What are the large, black marks seen on the Sun in this image?

Sirius is about 2 times the temperature of the Sun and about the same size. The luminosity of Sirius compared to the Sun is

Stellar spectral types (O, B, A, F, G, K, M) represent a sequence of changing

Compared to a star in the middle of the H-R diagram, a star in the lower left part of the diagram is

The interstellar medium is made up of matter in the form of

What is the distance to a star with an apparent magnitude of +7 and an absolute magnitude of +5?

Star clusters help us to learn about the evolution of stars because stars in a cluster are

The best place to search for black holes is in a region of space that

Measurements show a certain star has a very low luminosity (0.0001 times the Sun's) while its temperature is quite hot (20,000 K). How can this be?

What critical event must occur in order for a protostar to become a main sequence star?

While a star is on the main sequence, what is the primary nuclear reaction in the core?

For a massive star, what is the final object left behind in the image above

Red giants are more luminous than white dwarfs because

What is the significance of the Turn-Off point for a star cluster?

Stellar parallax measurements are used in astronomy to determine which one of the following properties of stars?

Two stars have the same luminosity. Star B is three times farther away than Star A. Compared to star A, Star B will look

Heavy elements up to and including iron, but not heavier than iron, are made in

What is a characteristic of a black hole?

The star Rigel has a luminosity of 100,000 Suns and the star Altair has a luminosity of 100 suns. If both stars are on the main sequences, then it follows that

Which of the following objects has the lowest overall density?

What is phase 1 in the diagram?

What is phase 2 in the diagram?

What is phase 3 in the diagram?

What is phase 4 in the diagram?

What is phase 5 in the diagram?

The Sun will get dimmer as it begins to run out of hydrogen fuel in its core.

Most known star masses have been determined from observations of binary star systems.