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
Physics & Space Science
How is proper motion measured?
What will be an ideal response?
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.
What is to the proper number of significant figures?
A) 0.91 B) 0.911 C) 0.9108 D) 0.9
Physics & Space Science