The moon and visible planets are always within a few degrees of the ecliptic
Indicate whether the statement is true or false
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What are the characteristics of an open cluster of stars?
A) mostly found above and below the galactic plane B) old age and millions of members C) a few hundred, mainly main sequence stars D) All stars are much more massive than our Sun. E) All stars are about the same age and luminosity.
Why don't we expect to find life on planets orbiting high-mass stars?
A) The stars are too hot to allow for life. B) Planets cannot have stable orbits around high-mass stars. C) The high-mass stars emit too much ultraviolet radiation. D) The lifetime of a high-mass star is too short.
Electromagnetic radiation has the properties of
A) waves only B) particles only C) neither waves or particles D) both waves and particles
How do you account for the fact that a sharp dividing line does not exist between one type of electromagnetic wave and its neighbor?