Neutral hydrogen may be detected between the stars because it emits ________
Fill in the blank(s) with correct word
21 cm radiation
Physics & Space Science
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A car is able to stop in a distance d. Assuming the same braking force, what distance does this car require to stop when it is traveling twice as fast?
A) d B) 2 d C) d D) 4 d E) 2 d
Physics & Space Science
From studies of the rotations of galaxies and dynamics of clusters, we now think that about ________ of the mass of the universe is composed of dark matter
Fill in the blank(s) with correct word
Physics & Space Science
The energy released by a certain reaction is enough to totally evaporate 125 kg of water at its boiling point. How much mass was lost during this reaction?
(LF = 334,000 J/kg for water, c = 3.00 × 108 m/s)
Physics & Space Science
Why is the sky blue?
Physics & Space Science