After recombination occurred, the Universe was plunged into a period of time known as the ___________, which lasted hundreds of millions of years until the first stars were born
Fill in the blank(s) with correct word
dark age
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A certain light source blinks once per second in its own frame of reference. As you recede from the blinking source, you observe the frequency of blinks to be
A) less than 1 Hz. B) 1 Hz. C) more than 1 Hz.
In a style rule, the HTML tag to which the rule applies is called the ______.
A. value B. declaration C. rule D. selector
The atmosphere of ____________________ contains acid compounds including sulfuric and hydrochloric acid
Fill in the blank(s) with correct word
Someone in Earth's rest frame says that a spaceship's trip between two planets took 10.0 y, while an astronaut on the space ship says that the trip took 6.27 y. Find the speed of the spaceship in terms of the speed of light
A) 0.779c B) 0.687c C) 0.975c D) 0.384c