What is the role of irregularities in the solar system in terms of theories of its origin?
A) They are too minor to play a role; astronomers ignore them.
B) They introduce a need for flexibility in theories of the solar system's origin.
C) Theories of the solar system are entirely based on the many irregularities found among the planets and moons.
D) The solar system has no irregularities; it is perfectly regular and orderly.
E) The solar system is chaotic, with irregularities the rule.
B
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A black hole may be visible because electromagnetic radiation is emitted from an ________ surrounding it, heated up enough to emit X-rays
Fill in the blank(s) with correct word
A material is optically active if it:
a. absorbs light passing through it. b. transmits all light passing through it. c. exhibits interference. d. rotates the plane of polarization of the light passing through it.
Light rays from a distant source __________________, assuming the light does not pass through any cloud-like nebulae
a. are perpendicular b. focus to an image c. focus to a point d. are parallel
The color of a mineral's powder is called its ______________
Fill in the blank(s) with correct word