According to current understanding, the first generation of stars in the universe ________ than differ stars born today.
A) were much more massive
B) contained much more hydrogen and helium
C) were much cooler in temperature
D) were much more likely to be members of binary star systems
A) were much more massive
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The impact of a 100-meter object will not cause "widespread" devastation, but it could still kill millions of people if it struck a major city. In Part C, you found that the probability of such an impact in any single year is only 1 in 1000. Suppose we learn that it has already been 1200 years since the last such impact. What would that tell us?
A. Nothing; we would still presume that the chance of such an impact during the next year is 1 in 1000. B. We are clearly due for such an impact, so the actual probability for the coming year must be much higher than 1 in 1000. C. We are overdue for the impact of a 100-meter object, so we should expect the impact of an even larger object during the next few years. D. There must be something wrong with the graph, because if the 1 in 1000 probability were correct, then there would have been an impact some time during the past 1000 years. Since there wasn't, the actual probability must be lower than 1 in 1000.
The luminosity of a Seyfert galaxy varies with a regular period of months or years
a. True b. False Indicate whether the statement is true or false
Which type of star would have the largest habitable zone?
A) O5V B) F5V C) M5V D) K5II E) White dwarf
Which has a greater mass?
A) four protons B) two neutrons and two protons in a helium nucleus C) A and B both have exactly the same mass.