Astronomical objects are viewed against the background of the ________
Fill in the blank(s) with correct word
celestial sphere
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Two plane mirrors are joined at a right angle. A beam of light is shone on one of the mirrors at an angle of incidence of 22 degrees, such that the reflected ray strikes the other mirror. What is the angle of incidence for the beam that strikes the second mirror?
A. 
B. 
C. 
D. 
How is the atmosphere of a planet affected by the rotation rate?
A) Faster rotation rates raise the atmospheric temperature. B) The rotation rate determines how long the planet is able to retain its atmosphere. C) The rotation rate determines how much atmosphere a planet has. D) Faster rotation rates produce stronger winds. E) Faster rotation rates raise surface temperatures and thus determine how much material is gaseous versus icy or liquid.
What property of a molecular cloud does not counteract gravitational contraction?
A) thermal pressure B) turbulent motions C) magnetic fields D) fragmentation
A scientific model is considered valid if it is consistent with
A) a single observation by an individual scientist B) the opinions of experts in the field C) repeated observations made by an individual scientist D) independent observations made by different scientists