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If we allow for a planet with a thick atmosphere and a strong greenhouse effect, the outer boundary of the Sun's habitable zone would be
Q15: In addition to nitrogen, the other main
Q19: If you arrange the following 15 bits
Q35: Basalt is a common type of<br>A) meteoritic
Q36: Approximately how soon might we expect an
Q42: You are traveling in a space ship
Q42: One type of early pre-cell (vesicle) probably
Q44: The fact that many of the larger
Q51: The major advantage the Allen Telescope Array
Q54: What is the "chicken-and-egg" type problem we
Q99: On January 1, 2010, Mehan, Incorporated purchased