If the universe is accelerating, it will expand forever
Indicate whether the statement is true or false
TRUE
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The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth
a. True b. False Indicate whether the statement is true or false
Which of the following is the Sun predicted to do in the future based on theoretical models and observations of other stars?
A) The Sun will gradually get brighter over time. B) The Sun will gradually get dimmer over time. C) The Sun will maintain the same brightness during its entire lifetime. D) The Sun will gradually rotate faster. E) The Sun will get gradually closer to the Earth.
Why does a high-mass star evolve differently from a low-mass star?
A. It has more material to burn so it can last longer. B. It is so bright that it drives material in space away from it so it can't gather up more fuel. C. It has a lower gravity so it can't pull in more fuel from space. D. It can fuse additional elements because its core can get hotter. E. The statement is false. High and low-mass stars evolve the same way.
In a hypothetical stream flowing downslope, stream discharge doubles and the cross-sectional area of the channel also doubles. For this situation, what will happen to the stream's speed?
What will be an ideal response?