Which factor(s) in the Drake equation (Number of Civilizations = NHP × flife × fcivilization × fnow) can we estimate based on discoveries of extrasolar planets?
A) NHP
B) flife
C) fcivilization
D) fnow
E) all of the above
A) NHP
Physics & Space Science
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What protects Earth from the high energy particles ejected from the Sun (the solar wind)?
a. the troposphere b. the stratosphere c. the exosphere d. the magnetosphere e. the Van Allen radiation belts
Physics & Space Science
Which planet(s) have an atmosphere that consists mostly of carbon dioxide?
A) Venus, Earth, and Mars B) Venus and Mars C) Venus only D) Mars only
Physics & Space Science
A __________ interacts via the strong interaction
Fill in the blank(s) with correct word
Physics & Space Science
Which of the following is a consequence of the Sun's relatively higher temperature compared to that of the Earth
What will be an ideal response?
Physics & Space Science