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The Earth's orbital eccentricity does not play a major role in our seasons, for perihelion occurs in January. Is this true on Mars also?

The Orion Nebula, M-42, is a hot, thin cloud of glowing gas, so its spectrum is A) a continuum, strongest in the color red B) a few dark line in the continuum C) a few bright lines against a dark background D) a continuum, but with both bright and dark lines mixed in E) not in the visible...

Describe two ways light can be separated out into its component colors in detail for spectroscopic analysis.

if the rest wavelength of a certain line is 600 nm, but we observe it at 594 nm, then A) the source is spinning very rapidly, at 1% of the speed of light B) the source is approaching us at 1% of the speed of light C) the source is receding from us at 10% of the speed of light D) the source is...