From studies of the masses of individual galaxies and the masses of clusters of galaxies, it is now apparent that up to ________ of the universe is composed of dark matter

Fill in the blank(s) with correct word


90%

Physics & Space Science

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What does "IR" stand for?

a. ultraviolet b. muon neutrino c. high frequency d. infrared

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How is proper motion measured?

What will be an ideal response?

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Each pattern shown below would appear on a screen when monochromatic light first passes through a narrow slit of width a and then strikes a screen. The darkest areas on the page represent the brightest areas on the screen. In which case is the slit illuminated with light of the longest wavelength?

a.


b.


c.

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What is to the proper number of significant figures?

A) 0.91 B) 0.911 C) 0.9108 D) 0.9

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