When dark matter was first discovered, some astronomers thought that ?o was greater than one from the extra gravity, favoring what type of universe?
What will be an ideal response?
This would have favored a closed or spherical universe that would eventually collapse back on itself.
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If you hold out your thumb at arm's length and rapidly blink each eye closed in an alternating pattern, your thumb appears to move left and right. This exercise is an example of _____________
Fill in the blank(s) with correct word
Which of the following statements best reflects our current knowledge about the term flife in the equation
Number of Civilizations = NHP × flife × fcivilization × fnow? A) The value of flife is either 0 or 1, but not anything in between. B) The value of flife is between 0 and 1. C) The value of flife is less than 0.0000001. D) The value of flife is equal to 1/2. E) The value of flife is greater than 0.9.
On average, how often do impacts large enough to produce mass extinction on the Earth occur?
A) once every century B) once every million years C) once in Earth's history D) once every thousand years E) once every hundred million years
If a new force were discovered with a range on the order of 10-18 m, predict the approximate mass of the exchange particle. (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
What will be an ideal response?