According to current evidence, Pluto is best explained as
A) a large member of the Kuiper belt.
B) a terrestrial planet that is surprisingly far from the Sun.
C) a very small jovian planet.
D) an escaped moon of Jupiter or Saturn.
A
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A gravitational lens occurs when
A) a massive object causes more distant objects to appear much larger than they should, and we can observe the distant objects with better resolution. B) a telescope lens is distorted by gravity. C) a massive object bends light beams that are passing nearby. D) dark matter builds up in a particular region of space, leading to a very dense region and an extremely high mass-to-light ratio.
In nuclear fusion,
a. light nuclei combine to form a heavier nucleus. b. a large nucleus splits into two smaller ones. c. an initial reaction triggers a chain reaction. d. protons are converted into neutrons and energy.
Which living organisms most resemble the common ancestor of all life according to genetic testing?
A) bacteria such as E. coli B) organisms living deep in the oceans around seafloor volcanic vents and in hot springs C) plankton that use sunlight as an energy source through photosynthesis D) viruses E) stromatolites