According to modern science, approximately how old is the Sun?
A) 25 million years B) 10,000 years C) 400 million years D) 4.5 billion years
D
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The law of conservation of momentum is applicable to systems made up of objects described by which of the following?
a. macroscopic b. microscopic c. interacting through friction d. All the above choices are valid.
When we say that jovian planets contain significant amounts of hydrogen compounds, we mean all the following chemicals except
A) water. B) carbon dioxide. C) ammonia. D) methane.
From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 121.6 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 121.8 nm
What can we conclude? A) The star is moving toward us. B) The star is moving away from us. C) The star is getting hotter. D) The star is getting colder. E) The "star" actually is a planet.
Why are Uranus and Neptune known as ice giants, rather than gas giants?
A. Their interiors may contain large quantities of water ice and other ices under tremendous pressure. B. Their interiors may contain liquid water and other materials that would be ices if not for the hot cores of those planets. C. Uranus and Neptune are much colder than Jupiter or Saturn. D. Uranus and Neptune are much smaller than Jupiter or Saturn. E. None of these choices are correct.