What is galactic cannibalism?
What will be an ideal response?
A large galaxy can pull material away from a small galaxy through gravitational tides. This merges the material of the small galaxy into the large one. This process is known as galactic cannibalism.
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Star X has an apparent magnitude of 3, and star Y has an apparent magnitude of 8. How do they compare in observed brightness?
A) Star X is 100 times brighter than star Y. B) Star X is 5 times brighter than star Y. C) Star Y is 100 times brighter than star X. D) Star Y is 5 times brighter than star X.
The resistance of a superconductor is infinite once it goes into the superconductivity state
Indicate whether the statement is true or false
What is an inertial reference frame? It is one
a. that does not accelerate. c. that accelerates at a constant rate. b. that accelerates at a varying rate. d. in which velocities are all constant.
The exospheres of the Moon and Mercury differ from the atmospheres of Venus, Earth and Mars in that
a. they are made of a very thin layer of carbon dioxide. b. they are made of a thick layer of water vapor. c. they extend much farther from the rocky surface. d. they are made of a thin layer of light atoms such as helium, sodium, and argon.