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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How is proper motion measured?
What will be an ideal response?
Physics & Space Science
What is to the proper number of significant figures?
A) 0.91 B) 0.911 C) 0.9108 D) 0.9
Physics & Space Science
What does "IR" stand for?
a. ultraviolet b. muon neutrino c. high frequency d. infrared
Physics & Space Science
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.
