Astronomers can determine the interiors of main sequence stars by _____

a. studying their atmospheres
b. creating stellar models
c. detailed observations of the Sun
d. using the Hertzsprung-Russell Stellar Model (HRSM)
e. satellite observations of the closest stars


b

Physics & Space Science

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Which of the following is the most abundant element in the Universe?

A) Nitrogen B) Oxygen C) Carbon D) Hydrogen

Physics & Space Science

It is difficult to see items sharply in dim light because what

A. We are seeing primarily with the rods
B. We are seeing primarily with the cones
C. Rods do not adapt to the dark
D. We are mostly seeing with the fovea

Physics & Space Science

Intensity of Sound: At a distance of 15.0 m from a sound source, the intensity level is 60.0 dB. What is the intensity level (in decibels) at a point 2.00 m from the source if the source radiates equally in all directions?

A. 55.7 dB B. 57.5 dB C. 75.5 dB D. 77.5 dB

Physics & Space Science

During a lunar eclipse the Moon's phase must be

A) 3rd quarter. B) 1st quarter. C) new. D) full.

Physics & Space Science