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WorksheetsHR-Diagram and Binary Stars
Total questions: 20
Worksheet time: 13mins
Astronomers use luminosity and surface temperature to classify stars.
True
False
Color index does not allow astronomers to determine star temperature.
True
False
The Hertsprung-Russell (H-R) diagram demonstrates the relationship of luminosity and temperature.
True
False
Spectroscopic binaries can be distinguished from each by using a telescope.
True
False
Red stars live for only a few million years.
True
False
Blue giant stars live for almost a trillion years.
True
False
Typical lifespan for a _____ star is about 10 billion years.
Red
Yellow
Blue
Orange
90% of all stars lie on the _____ region of the H-R diagram.
red giant
main sequence
supergiant
white dwarf
Astronomers go about determining a star's temperature by measuring its _____.
absolute magnitude
apparent magnitude
luminosity
color index
The _____ shift in a star’s spectra tells whether a star is moving away or towards the Earth and how fast.
parallax
blue
red
doppler
Sirius A & B are a good example of a _____ system.
binary
multiple
star
planetary
_____ binaries have widely separated members that can easily be seen with a telescope.
Multiple
Spectroscopic
Visual
Close
_____ binaries have very close members that cannot be resolved using a telescope.
Multiple
Spectroscopic
Visual
Close
Many of the K & M – class stars will shine for at least another _____ years.
thousand
million
billion
trillion
Proxima Centauri is the closest star to Earth after the Sun and is located 4.3 light years away from Earth. How long does it take light from Proxima Centauri to reach Earth?
1 year
4.3 years
43 years
10 trillion years
Where are the brightest stars found on the HR diagram?
at the top of the diagram
at the bottom of the diagram
anywhere on the right side of the diagram
anywhere on the left side of the diagram
