On what basis did Herschel think he had found a comet?
A) The object appeared as a small greenish disk in his telescope.
B) It appeared to be moving slightly night by night.
C) No star appeared in that position on his charts.
D) It was not a point of light, like a star should appear.
E) All of the above are correct.
E
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Which element would not have been found in Earth's early atmosphere? What is the most abundant gas found in Earth's atmosphere today?
a. nitrogen (N2) b. carbon dioxide (CO2) c. helium (He) d. hydrogen (H) e. oxygen (O2)
According to the text, humans have a _____ size compared to stellar and microscopic objects
a. extra small b. small c. medium d. large
If you push a 4-kg mass with the same force that you push a 10-kg mass from rest, then
A) both masses accelerate at the same rate. B) the 10-kg mass accelerates 2.5 times faster than the 4-kg mass. C) the 4-kg mass accelerates 2.5 times faster than the 10-kg mass. D) the 10-kg mass accelerates 4 times faster than the 4-kg mass. E) the 4-kg mass accelerates 4 times faster than the 10-kg mass.
Most pulsars emit
A) visible light. B) gamma rays. C) X-rays. D) radio waves. E) nothing.