What caused early astronomers to believe that our galaxy is only about 6,000 light-years across?
A) Telescopes were not powerful enough to observe stars farther away.
B) Interstellar dust blocked visible light from stars farther away.
C) Stars farther away could not be resolved as individual objects.
D) Astronomers miscalculated the distances to stars, believing that the stars were 50 times closer than they actually were.
E) Astronomers assumed all red stars were faint main-sequence stars, and they confused more luminous red giants with them.
Correct Answer:
Verified
Q9: In the Great Debate of 1920, Curtis
Q10: What did Edwin Hubble study in the
Q11: The CMB contains photons left over from
Q12: When we measure distances to very faint
Q13: It is possible for a galaxy to
Q15: As the universe expands, the sizes of
Q16: The abundance of various elements formed from
Q17: There is no special center to the
Q18: In the Great Debate of 1920, Curtis
Q19: The only chemical elements that formed as
Unlock this Answer For Free Now!
View this answer and more for free by performing one of the following actions
Scan the QR code to install the App and get 2 free unlocks
Unlock quizzes for free by uploading documents