Almost all molecules in space are based on what element? Why?
What will be an ideal response?
Carbon forms a host of chains of complex molecules, some of which are essential to life. The basic building blocks of life on Earth, such as amino acids, are all found in the giant molecular clouds, so carbon and water based chemistry conducive to life may be common on many planets forming around new stars.
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The fact that nearly all galaxies are moving away from us, with more distant ones moving faster, helped us to conclude that:
a. The universe is expanding. b. Galaxies repel each other like magnets. c. Our galaxy lies near the center of the universe.
If all the "dark matter" in the Universe were somehow instantaneously removed, which of the following would happen?
A) The Solar System would fly apart. B) All the stars in the Milky Way would collapse into the central black hole. C) Clusters of galaxies would no longer be gravitationally bound together. D) Atoms would split into nuclei and free electrons.
Stored potatoes, beets, and rutabagas freeze at temperatures below zero degrees Celsius (rather than at exactly zero) because
A) they are good radiators of energy. B) they are good absorbers of radiant energy. C) the water in them contains dissolved salts and sugars. D) they are relatively dense. E) all of the above
A temperature difference of 9.0 Celsius degrees is equal to a Fahrenheit temperature difference of
a. 5.0 Fahrenheit degrees. b. 9.0 Fahrenheit degrees. c. 16 Fahrenheit degrees. d. 37 Fahrenheit degrees. e. 41 Fahrenheit degrees.