Describe two general ways we learn about the Sun's interior
What will be an ideal response?
(1 ) Astronomers create mathematical models that use the laws of physics and the Sun's observed composition, mass, and age to compute its internal conditions. Therefore, we believe that our models are accurate if they can reproduce the characteristics of the Sun that we can observe (such as its radius and luminosity). (2 ) By measuring Doppler shifts of material on the Sun's surface, we observe vibrations of the surface that are created deep within the Sun. We can learn about the densities and other characteristics of the various layers within the Sun by studying how the waves propagate throughout the Sun. (3 ) Another way that we can learn about the interior of the Sun is by detecting solar neutrinos that are produced by the nuclear fusion reactions occurring in the Sun's core.
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Most of the current star formation in the Milky Way occurs in spiral arms
Indicate whether the statement is true or false
The Moon's maria, or plains, are believed to have been caused by ______________
Fill in the blank(s) with correct word
Which of the following statements is true of L dwarfs?
A) They are cooler than M stars. B) They are cooler than T dwarfs. C) They are fainter than T dwarfs. D) They are brighter than M stars.
The _______________ of the moon is the period of time for the moon to complete a cycle of the lunar phases and is approximately 29.5 days long
a. sidereal period b. saros cycle c. synodic period d. eclipse season e. umbral period