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AST 111 Study test with Questions Solved 100% Correct| Verified
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AST 111 Study test with Questions Solved 100% Correct| Verified
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AST 111 Study test with Questions Solved100% Correct| Verified
How do we know the Sun's mass? - ✔✔We can calculate it by applying Newton's version of
Kepler's third law with Earth's orbital period (1 year) and Earth's average distance from the Sun
(1 AU).
How do we really know the Sun's internal fusion rate? - ✔✔1) Measurements of the Sun's
total energy output into space.
2) Observations of neutrinos coming from the Sun.
Solar Maximum - ✔✔1) Sunspots are most numerous on the Sun.
2) Auroras are most likely in the Earth's sky.
3) Orbiting satellites are most at risk.
4) Solar flares are most common.
5) Occurs about 11 years after a solar maximum (on average).
Solar Minimum - ✔✔Occurs about 5 to 6 years after a solar maximum (on average).
Before we can use parallax to measure the distance to a nearby star, we first need to know... -
✔✔...the Earth-Sun distance.
Which of the following is a valid way of demonstrating parallax for yourself? - ✔✔Hold up
your hand in front of your face, and alternately close your left and right eyes.
What is the cause of stellar parallax? - ✔✔Earth's orbit around the Sun.
The more distant a star... - ✔✔...the smaller its parallax angle.
, Luminosity Rules for any planet in our Solar System - ✔✔1) If two stars have the same
luminosity, but one is closer to the Earth, the closer star will appear brighter in the Earth's sky.
2) If a star is twice as luminous, but twice as far away, it will appear less than bright than the
less luminous star.
3) However, if a star has four times the luminosity, but is twice as far away, it will appear
exactly as bright as the other star.
Compared to a main-sequence star with a short lifetime, a main-sequence star with a long
lifetime... - ✔✔...less luminous, cooler, smaller, and less massive.
Compared to a high-luminosity main-sequence star, stars in the upper right of the H-R diagram
are... - ✔✔...cooler and larger in radius.
Compared to a low-luminosity main-sequence star, stars in the lower left of the H-R diagram
are... - ✔✔...hotter and smaller in radius.
The ___ ____ _____ is greater for low-mass stars than it is for high-mass stars. - ✔✔_main-
sequence lifetime_
The stars known as _______ are the very largest and brightest of all the stars. -
✔✔_supergiants_
Most of the stars near the Sun are... - ✔✔...main-sequence stars.
Stars are classified on the basis of their spectral type and ____ ____ - ✔✔_luminosity class_
Cepheids are examples of... - ✔✔...pulsating variable stars.
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