Why is the hypothesis that life on Earth came from outer space considered plausible?
A) because alien DNA is like human DNA
B) because organic molecules have been found in space
C) because many meteorites contain complex organic molecules
D) because Earth has had many collisions in its history
E) because Earth formed with the Sun from the solar nebula
C
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The daytime surface temperature of Mercury is higher than Earth's Moon's surface temperature because
a. clouds shield the Earth's Moon during the day. b. Mercury is farther from the Sun than the Earth's Moon. c. Mercury is closer to the Sun than the Earth's Moon. d. the atmosphere of the Earth's Moon has a strong greenhouse effect.
The rest mass of a photon is zero kg
Indicate whether the statement is true or false
Most radio telescope searches for signs of intelligent life are performed in the water hole
Indicate whether the statement is true or false
When Peter tosses an egg against a sagging sheet, the egg doesn't break due to
A) reduced impulse. B) reduced momentum. C) both of these D) neither of these