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Most millisecond pulsars are found in ________ star clusters.
The primordial nucleosynthesis was sped up by the abundance of ________ in the
universe once the temperature dropped below a billion K.
Water is one of the most common substances in the universe, and vital to us on Earth.
What happened to it on Mars?
What would happen to a large moon inside the Roche Limit?
What happened to the dinosaurs? How does that enter into the Drake Equation?
If our Sun belonged to Population II, it is unlikely that ________ planets could orbit it.
The apparent angular shift of any object across a distant background, when viewed
from two different places, is called ________ shift.
In size and mass, irregular galaxies tend to be ________ than spirals.
Why do population II stars contain almost nothing but hydrogen and helium?
According to Newton's first law, if a body is moving in the absence of any net external
force, describe the continuing motion of the object.
Describe the cycle of life and death we observe in the spiral arms.
Hubble divided the spirals into normal and ________ categories.
The fast rotation of newly formed neutrons stars is due to conservation of ________.
Discovered in the 1990s, the ________ is a vaster, darker version of the more famed
asteroid belt between Mars and Jupiter.
The discovery of the ________ at Bell Labs strongly supported the Big Bang.
A black hole can be created in a ________, even more violent than supernovae.
