Which of the following is a consequence of the discovery of hot Jupiters for understanding our own Solar System?
A) It shows that our Solar System is very unusual.
B) It shows that our Solar System is very typical.
C) It shows that we do not fully understand the formation of our Solar System.
D) It shows that life in the Universe is rare.
E) It shows that Jupiter is unusually cold.
C
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On the H-R diagram, the bright blue stars that dominate the naked-eye sky lie
A) at the top left. B) at the lower left. C) in the middle of the main sequence. D) at the top right. E) at the lower right.
How does the hypothesis of inflation account for the existence of the "seeds" of density from which galaxies and other large structures formed?
A) Inflation would have caused random, microscopic quantum fluctuations to grow so large in size that they became the seeds of structure. B) Inflation predicts that gravity would have been very strong and thereby would have concentrated mass into seeds. C) Inflation tells us that the universe should have a "flat" overall geometry, and this led to the flat disks of galaxies. D) Inflation predicts that temperatures and densities should have become nearly equal throughout the universe.
Astronomers have used observations from the Hubble Space Telescope to measure the rate at which the universe is expanding, and have estimated the age of the universe from that measured rate. Suppose the expansion turns out to be faster than current measurements indicate. In that case, our new estimate for the age of the universe would be
A) unaffected. B) younger (less time between now and the Big Bang). C) older (more time between now and the Big Bang).
The solar corona is much cooler than the Sun's surface; hence we must wait for a total solar eclipse to glimpse it with the naked eye
Indicate whether the statement is true or false