Which of the following is true about irregular galaxies?
A) They are composed solely of old stars.
B) They generally have significant bulge populations.
C) They were more common when the universe was younger.
D) They have reddish colors.
E) They have well-defined spiral arms.
C) They were more common when the universe was younger.
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If Earth's rotation slowed down so that it completed exactly one rotation about its axis in 100 hours, what would be the typical time interval between sunrise and sunset? If Earth's rotation slowed down so that it completed exactly one rotation about its axis in 100 hours, what would be the typical time interval between sunrise and sunset?
a. 100 hours b. 50 hours c. 25 hours d. 24 hours
In the context of Uranus's rings, the passage of the planet in front of a star is referred to as a(n) _____
A) ablation B) blueshift C) occultation D) fasciculation
Earth's magnetic field is generated in the iron rich mantle
Indicate whether the statement is true or false
Most interstellar clouds remain stable in size because the force of gravity is opposed by ________ within the cloud.
A) thermal pressure B) degeneracy pressure C) radiation pressure D) stellar winds