The vast majority of stars in a newly formed star cluster are ________
A) red giants B) very high-mass, type O and B stars
C) less massive than the Sun D) about the same mass as our Sun
C
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Suppose you could float in space just a few meters above Saturn's rings. What would you see as you looked down on the rings?
A) countless icy particles, ranging in size from dust grains to large boulders B) a solid, shiny surface, looking much like a piece of a Blu-ray disk or DVD (or vinyl record album) but a lot bigger C) dozens of large "moonlets" made of metal and rock, each a few kilometers across D) long, solid strings of matter, each distinct from the next
What would you expect to be different in a planetary system in which the nebular gas is blown into interstellar space by a stellar wind earlier than occurred in our solar system?
A) No terrestrial planets would form. B) Jovian planets would be less massive because they had less time to gather hydrogen and helium gas. C) All planets would be more massive than Jupiter. D) Most of the planets would be destroyed by migration onto the central star.
Laboratory measurements show hydrogen produces a spectral line at a wavelength of 486.1 nanometers (nm). A particular star's spectrum shows the same hydrogen line at a wavelength of 486.0 nm. What can we conclude?
A) The star is getting hotter. B) The star is getting colder. C) The star is moving toward us. D) The star is moving away from us.
The strong force is to gluons as the gravitational force is to
A) Z particles. B) quarks. C) photons. D) gravitons. E) neutrinos.