At present, what is the primary way that astronomers carry out SETI programs (that is, search for extraterrestrial intelligence)?
A) by using radio telescopes to search for signals from extraterrestrial civilizations
B) by analyzing the spectra of extra-solar planets in an attempt to detect oxygen
C) by searching for planets around distant stars
D) by using X-ray telescopes to search for signals from extraterrestrial civilizations
E) by analyzing high-resolution images of nearby stars in search artificial structures
A
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How many Torino 2 asteroids are known to exist?
a. 0 b. <5 c. 5-10 d. >10
The primary reason for adding fiber reinforcement to a ceramic matrix is to increase the resistance to _________.
Fill in the blank(s) with the appropriate word(s).
Which of the following materials is not cross-linked?
(a) Rubber (b) Epoxy (c) UHMWPE (d) Polyester
Which of the following best explains the origin of primitive meteorites?
A) They are leftover chunks of rock from the earliest period in the formation of the solar system. B) They are fragments of comets rather than of asteroids. C) They are fragments of an asteroid that was shattered by a collision. D) They are fragments of rock chipped off the planet Mercury. E) They are fragments of rock chipped off the planet Mars.