As shown in the diagram, you've just shined a flash light toward Al, so from your point of view the light is moving to the right at speed c. Al is moving away from you to the right at speed 0.9c. According to Al, what is the light doing?
A) moving to the right at speed c
B) gradually catching up to him at speed 0.1c
C) moving to the right at speed 1.9c
D) moving to the left at 0.1c
A) moving to the right at speed c
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Like latitude on Earth, ________ in the sky is measured in degrees north and south of the equator
Fill in the blank(s) with correct word
The "big bang" was an explosion of material that created galaxies flying away from the center of the explosion
a. True b. False Indicate whether the statement is true or false
The pink color of the chromosphere arises from the emission of light from
A) hydrogen atoms. B) helium atoms. C) carbon atoms. D) beryllium atoms.
Which of the following best describes the modern definition of a constellation
a) a group of stars that all lie at about the same distance from Earth b)a region of the celestial sphere c)a pattern of bright stars in the sky