Based on the H-R diagram shown above, about how long does a main-sequence star of spectral type O spend fusing hydrogen into helium in its core?
A) 1000 years
B) 10,000 years
C) 10 million years
D) 100 million years
E) 1 billion years
C) 10 million years
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Which produces tides on Earth?
a. Moon b. Sun c. Moon and Sun d. None of the other choices are correct.
The Planck era is another name for the present period of time in the universe
Indicate whether the statement is true or false
The speed of light changes when it goes from ethyl alcohol (n = 1.36) to carbon tetrachloride (n = 1.46). The ratio of the speed in carbon tetrachloride to the speed in ethyl alcohol, v2/v1, is
a. 1.99 b. 1.07 c. 0.932 d. 0.511 e. 0.760
Which of the following is not a major idea of Einstein's general theory of relativity?
A) It is possible to travel through wormholes. B) Time runs slower near strong gravitational fields. C) Our universe can have no center or boundaries, yet be finite. D) Black holes can exist in spacetime, and falling into a black hole means leaving the observable universe. E) Large masses that undergo rapid changes in motion or structure can emit gravitational waves that travel at the speed of light.