Explain why galaxy collisions are far more common than star-star collisions.
What will be an ideal response?
Answer: 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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Motion of the plates of Earth's crust is thought to be due to
a. the solar wind. b. convection from the hot interior. c. tides in the oceans. d. friction between wind and the land surface. e. Earth's magnetic field.
Which of the following is NOT true about color and visual contrast in web design?
A. Webpages can use color to evoke mood. B. Limit your website color scheme to five or six contrasting colors. C. The WAI specifies that color contrast should be sufficient for visitors using a monochrome monitor. D. One way to select an appropriate color scheme is to use a template.
When the Sun becomes a white dwarf with a surface temperature similar to its current surface temperature, what will its luminosity be?
What will be an ideal response?
An important radiometric dating process is the decay of potassium-40 to ______________-40
Fill in the blank(s) with correct word