Stars and Nebulas

In what range of masses are most stars found? a. .1 to 100 solar masses b. .01 to 100 solar masses c. 1 to 3 solar masses d. stars can have any mass e. .1 to 2 solar masses

.1 to 100 solar masses

What is the typical main sequence lifetime of a G-type star? a. 10 million years b. 10 billion years c. 1 billion years d. 100 million years e. 100 billion years

10 billion years

What is the typical main sequence lifetime of a B-type star a. 100 million years b. less than a million years c. 10 billion years d. 20 million years e. 1 billion years

20 million years

About how many stars can be seen from somewhere on Earth with the naked eye? a. 600,000 b. 600 c. 6,000,000 d. 6,000 e. unaccountably many

6,000

Interstellar gas is composed of: a. ammonia, methane, and water vapor b. some hydrogen, but mainly carbon dioxide c. 10% hydrogen, 90% helium by numbers of atoms d. 90% hydrogen, 9% helium by weight e. only hydrogen

90% hydrogen, 9% helium by weight

Which of the following has NOT yet been observed in space a. methyl alcohol b. hydrogen cyanide c. ammonia d. formaldehyde e. DNA

DNA

In comparing first magnitude Deneb with second magnitude Polaris, we find that: a. Polaris is really 100 times brighter than nearby Deneb b. Deneb is really much closer than Polaris c. Deneb appears 2.5 times brighter to us than Polaris d. Deneb must be much hotter than Polaris e. Polaris is in reality much more luminous

Deneb appears 2.5 times brighter to us than Polaris

Star A has an absolute magnitude of 2.5 and star B has an apparent magnitude of 2.5 but star A is a main sequence star and star B is a red giant. Which statement below is true? a. Star A appears brighter than star B, but actually star B and star A are the same brightness b. Star A and star B appear to have the same brightness, but actually star B is brighter than star A c. It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above d. Star B appears brighter than star A, but actually star B and A are the same brightness e. Star A and star B appear to have the same brightness, but actually star A is brighter than star B

It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above

Which of the following regarding Red Dwarfs is not true? a. Red Dwarfs are very rare types of stars in the universe b. Red dwarfs produce a temperature that is not as hot as many other types of stars c. Red Dwarfs have an absolute magnitude greater the +5 d. Red Dwarfs have a low luminosity e. Red Dwarfs live for hundreds of billions of years

Red Dwarfs are very rare types of stars in the universe

Star A and star B both have an apparent magnitude of 4.0, but star A has an absolute magnitude of 1.0 and star B has an absolute magnitude of 7.0. Which statement below is correct? a. Star A and star B appear to have the same brightness, but actually star B is brighter than star A b. It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above c. Star B appears brighter than star A, but actually star B and A are the same brightness d. Star A appears brighter than star B, but actually star B and star A are the same brightness e. Star A and star B appear to have the same brightness, but actually star A is brighter than star B

Star A and star B appear to have the same brightness, but actually star A is brighter than star B

Star A and star B both have an absolute magnitude of 2.0, but star A has an apparent magnitude of 5.0 and star B has an apparent magnitude of 7.0. Which statement below is accurate? a. Star B appears brighter than star A, but actually star B and A are the same brightness b. Star A appears brighter than star B, but actually star B and star A are the same brightness c. Star A and star B appear to have the same brightness, but actually star B is brighter than star A d. Star A and star B appear to have the same brightness, but actually star A is brighter than star B e. It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above

Star A appears brighter than star B, but actually star B and star A are the same brightness

Star A and star B both have an apparent magnitude of 7.0, but star A is at a distance of 15 pc and star B is at a distance of 30 pc. Which statement below is correct? a. It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above b. Star B appears brighter than star A, but actually star B and A are the same brightness c. Star A and star B appear to have the same brightness, but actually star A is brighter than star B d. Star A appears brighter than star B, but actually star B and star A are the same brightness e. Star A and star B appear to have the same brightness, but actually star B is brighter than star A

Star A appears brighter than star B, but actually star B and star A are the same brightness

Star A and star B both have an absolute magnitude of 2.0, but star A is at a distance of 50 pc and star B is at a distance of 20 pc. Which statement below is correct? a. It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above b. Star A and star B appear to have the same brightness, but actually star A is brighter than star B c. Star A and star B appear to have the same brightness, but actually star B is brighter than star A d. Star B appears brighter than star A, but actually star B and A are the same brightness e. Star A appears brighter than star B, but actually star B and star A are the same brightness

Star B appears brighter than star A, but actually star B and A are the same brightness

Which star is currently the largest star in our visible universe? a. the sun b. Betelgeuse c. Sirius d. VY Canis Majoris e. UY Scuti

VY Canis Majoris

A type of neutron star with immense magnetic fields is known as: a. a pulsar b. a black dwarf c. a black hole d. a white dwarf e. a magnetar

a magnetar

What is the typical main sequence lifetime of an M-type star a. ten million years b. ten billion years c. a trillion years d. one million years e. one billion years

a trillion years

What is the correct order of color light emitted by stars from hottest to coolest? a. white, orange, yellow, blue, red b. blue, white, yellow, orange, red c. blue, white, orange, yellow, red d. red, orange, yellow, white, blue e. blue, yellow. white, orange, red

blue, white, yellow, orange, red

Which type of star is considered a "failed star" a. red dwarf b. brown dwarf c. white dwarf d. black dwarf e. neutron star

brown dwarf

In the Milky Way galaxy, gas and dust are found: a. in emission nebulae b. everywhere c. in molecular clouds d. in dark nebulae e. in neutral hydrogen clouds

everywhere

Complex molecules in space are found: a. inside dense dust clouds b. in the photo sphere of red giant stars c. in the coronas of stars like our Sun d. scattered evenly throughout interstellar space e. surrounding the more energetic young stars.

inside dense dust clouds

What are the two most important intrinsic properties used to classify stars? a. distance and surface temperature b. distance and luminosity c. luminosity and surface temperature d. distance and color e. mass and age

luminosity and surface temperature

A "fuzzy" dark or light patch in the sky is called a: a. comet b. cloud c. galaxy d. dust lane e. nebula

nebula

Complex molecules in the interstellar medium are found: a. scattered evenly throughout the universe, a product of the Big Bang b. primarily in the dense dust clouds c. only around the super giant stars like Betelgeuse that make their heavy atoms d. on the surfaces of the coolest class K and M stars only e. uniformly throughout the disk of the galaxy

primarily in the dense dust clouds

A reflection nebula is caused by : a. starlight scattered by dust particles b. emission by ionized gas c. sunlight reflected off a surface d. sunlight scattered by dust particles e. starlight reflected off of a surface

starlight scattered by dust particles

The spectra of interstellar gas clouds show that they have the same basic composition as: a. asteroids b. interstellar dust c. the martian polar caps d. stars e. earths atmosphere

stars

Some regions along the plane of the milky way appear dark because: a. stars in that region are hidden by dark dust particles b. stars in that region are hidden by interstellar gas c. there are no stars in these areas d. many brown dwarfs in those areas absorb light which they turn into heat e. many black holes absorb all light from those directions

stars in that region are hidden by dark dust particles

The star's color index is a quick way of determining its: a. density b. composition c. temperature d. mass e. luminosity

temperature

What physical property of a star does the spectral type measure? a. density b. temperature c. composition d. luminosity e. mass

temperature

In general, the narrower the spectral line of a star: a. the cooler the star is b. the bigger the star is c. the hotter the star is d. the denser the star is e. the smaller the star is

the bigger the star is

The most famous G type star is: a. the sun b. Betelgeuse c. Pollux d. Polaris e. Sirius

the sun

Which of the following best explains why white dwarfs continue to illuminate the cosmos following a planetary nebula? a. these stars continue to be active even after the death of a star b. these stars reflect nearly 100% of the light from nearby stars c. these stars have stopped nuclear fusion but contain thermal energy d. these stars burn H to He at an efficient rate e. these stars bur He into heavier elements

these stars have stopped nuclear fusion but contain thermal energy

What does it mean when a star is in the Main Sequence? a. this indicates where a star will go supernova during its life b. this indicates where a star is located during its death phase c. this indicates where a star is only when it it formed d. this indicates where a star will spend the majority of its life e. this indicates where a star has stopped nuclear fusion

this indicates where a star will spend the majority of its life

Stars that have masses similar to the Sun's, and sizes similar to the Earth are: a. white dwarfs b. red giants c. main sequence stars d. brown dwarfs e. red dwarfs

white dwarfs