Multiple Choice
Early in the 20th century, our Galaxy was estimated to be:
A) about 100,000 ly in diameter.
B) about 35,000 ly (10 kpc) in diameter.
C) about 10 million ly in diameter.
D) not much larger than our solar system.
E) about 2.5 million ly in diameter.
Correct Answer:
Verified
Correct Answer:
Verified
Q100: How are Cepheids and RR Lyrae stars
Q101: The gravitational microlensing technique has detected _
Q102: William Herschel's original model for our Galaxy
Q103: Star formation ceased first in the:<br>A)Galactic nucleus.<br>B)spiral
Q104: The Milky Way is simply our edge-on
Q105: The Earth lies close to the center
Q107: Both RR Lyrae and Cepheid variable stars
Q108: The location of the Galactic Center was
Q109: The leading explanation for the existence of
Q110: Henrietta Leavitt's period-luminosity relation for _ indicates