Multiple Choice
Why is it easier to use Doppler shifts to discover binary stars than to discover planets orbiting other stars?
A) The orbital periods of binary stars are longer than those of planets
B) The Doppler shifts are very small in the case of planets
C) For planets the shifts are so large they shift the lines out of the visible
D) Stars orbited by planets do not generally show spectral lines
Correct Answer:
Verified
Correct Answer:
Verified
Q1: About what percentage of the planets discovered
Q3: Which of the following is one of
Q4: Billions of years from now,the habitable zone
Q5: How are pulsar planets detected?<br>A)By looking for
Q6: Why is the frequency range between 1
Q7: An organism's characteristics are encoded in its<br>A)DNA<br>B)Amino
Q8: Which strategies have been used to look
Q9: The oldest fossils date from about how
Q10: About how long does it take radio
Q11: Why does the habitable zone shift outward