Mercury is mostly comprised of a large metallic core
a. True
b. False
Indicate whether the statement is true or false
True
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This graph shows a light curve for a star. What can you conclude from this graph?
A) The star periodically dims and brightens, with a brightness peak about once a year. B) The star is orbited by a large planet. C) The star is about 100 times as bright as the Sun. D) The star is moving alternately toward and away from us.
Astronomers use roman numerals to indicate the ionization state of a gas. Ionized hydrogen is indicated by which of the following symbols?
A) H II B) H2 C) H I D) E) H III
The visible parts of galaxies contribute about 10 percent of the critical density of the universe
Indicate whether the statement is true or false
A(n) ______ website organizes webpages into categories and subcategories.
A. hierarchical B. webbed C. linear D. structured