Nautical Sciences, Unit Four, Chapter Six: The Stars
This is an Closed Book, Multiple-choice exercise.
Use your mouse to click the box next to the most correct answer. If you fail to select the correct answer you must try again until you select the correct answer.
What is the closest star to the Earth?
The Sun
Proxima Centauri
Polaris
Alpha Centauri
Arcturus
What is the most commonly used measurement of astronomical distances?
A light-year
A parsec
An astronomical unit
A kilometer
A nautical mile
What two features are used by astronomers to classify stars?
Their color and temperature
Their color and spectrum
Their spectrum and temperature
Their age and spectrum
Their age and temperature
What diagram is used by astronomers to group stars according to their color and their magnitude or stellar brightness?
Spectrum-luminosity diagrams
Temperature-spectrum diagrams
Apparent magnitude diagrams
Absolute magnitude diagrams
Main sequence diagrams
In general, blue stars are ______ and ______ while red stars are ________ and __________.
Large, bright, small, dim
Large, dim, small, bright
Small, dim, large, bright
Small, bright, large, dim
Small, bright, large, bright
The brightness of a star as it appears to an observer on Earth called its ____________________.
Apparent magnitude
Absolute magnitude
Luminosity magnitude
Observed magnitude
Spectral luminosity
The brightness that a star would have 10 parsecs away from the Earth is known as the star's ________________________.
Absolute magnitude
Apparent magnitude
Luminosity magnitude
Observed magnitude
Spectral luminosity
Our Sun is most similar to which of the stars listed below?
Altair
Rigel
Polaris
Arcturus
Capella
These types of stars are 100 times fainter than our Sun but much hotter.
White dwarfs
Blue giants
Red giants
Red supergiants
Cepheid variables
What type of stars have been called the "lighthouses of space"?
Cepheid variables
White dwarfs
Pulsars
Quasars
Blue giants
What is/are the determining factor(s) in what kind of a star will develop in a region of space?
The amount of gas and dust that is available.
The speed of rotation of the dust cloud
The distance of the star from the center of the galaxy
The nearness of the star to other stars
The instability in the magnetic flux of space at that point.
Which of the star types below would have the longest life?
Orange dwarfs
White dwarfs
Blue giants
Red giants
Yellow, main-sequence stars
Which of the following is NOT a type of nebula?
These are all types of nebula
None of the these are types of nebula
Dark nebula
Bright nebula
Planetary nebula
Which type of nebulae do not have an illuminating star nearby?
Dark nebula
Bright nebula
Planetary nebula
Black holes
Ghost nebula
Which type of nebula consist of a nova with a large cloud of particles surrounding it?
Planetary nebula
Bright nebula
Dark nebula
Supernovas
Back holes
Larger groupings of stars are called what?
Star clusters
Planetary nebula
Bright nebula
Dark nebula
Binaries
This type of star cluster is often found in areas where there are glowing masses of dust and gas.
Open clusters
Moving clusters
Globular clusters
Star clouds
Spiral galaxies
Why are most of the stars in the center of the Milky Way invisible to us on Earth?
Because of the amount of gas and dust in the way
Because they are so old that they burned out long ago
Because of their great distance from the Earth
Because a black hole in the center of the galaxy prevents their light from escaping
They aren't invisible. They can be clearly seen with a telescope.
Where are Population I stars located?
In regions where there is a great deal of dust and gas.
In regions where there is little dust and gas.
In the spiral arms of the Milky Way galaxy.
In the center of the Milky Way galaxy.
Outside of the Milky Way, in the Magellanic Cloud.
Which type of galaxies have clearly defined, symmetrical shapes?