Explain why galaxy interactions are far more common than star-star interactions
What will be an ideal response?
Galaxies are much closer together, relative to their size, than stars are. If the Sun were made the size of a grapefruit, the nearest star would be on the other side of the continent. However, if the Milky Way (or any other galaxy) were made the size of a grapefruit, there would likely be another galaxy within a few feet of it. Thus, galaxy interactions are far more common than star-star interactions and must be taken into account when considering galaxy evolution.
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In A.D. 1054, Chinese astronomers observed the appearance of a new star, whose location is now occupied by
a. a globular cluster. b. a planetary nebulae. c. a white dwarf. d. a young massive star. e. a supernova remnant.
A merger between a small elliptical galaxy and a large spiral galaxy will most likely result in:
A) a large elliptical. B) a large spiral. C) a small elliptical and a large elliptical. D) a small elliptical and a large spiral. E) a small spiral and a large elliptical.
Explain how astronomers determine the size of an asteroid without resolving it
What will be an ideal response?
A superconducting wire's chief characteristic is which of the following?
a. no resistance c. an extremely great length b. a large cross sectional area d. an extremely high temperature