Do you think it is possible that a flare star could harbor an advanced civilization? Explain your reasoning
What will be an ideal response?
A flare star has violent flare activity that might disrupt the upper atmosphere of a planet and send energetic particles and X-rays flying through living organisms—not very pleasant.
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If the universe is closed and finite, then
a. the universe has a center and an edge. b. the universe will expand forever. c. the final fate of the universe will be very cold and of extremely low density . d. the space-time of the universe is negatively curved. e. none of the above
Time Dilation: As measured in Earth's rest frame, a spaceship traveling at 0.9640c takes 10.5 y to travel between two planets that are not moving relative to each other. How long does the trip take as measured by someone on the spaceship?
A. 2.79 y B. 6.82 y C. 39.5 y D. 28.8 y
These two diagrams contrast the habitable zones around the Sun and around a much lower mass star. They are shown to scale. Based on what you see here, what can you conclude about the possibility of finding life around the lower-mass star compared to finding life around a Sun-like star?
A) There is a higher probability that an orbiting planet will be in the habitable zone for a Sun-like star than for a lower-mass star. B) Sun-like stars must always have more life around them than lower-mass stars. C) A Sun-like star always has at least two habitable planets, while a lower-mass star may have only one habitable planet. D) There is virtually no chance of finding life around a lower-mass star.
According to Copernicus, retrograde motion occurs at opposition for the outer planets
Indicate whether the statement is true or false