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Question
The apparent annual path the Sun takes through the sky is called the ________.Answer
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Related questions
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If the value of H is doubled, it would also double the age of the universe.
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Compare the Copernican principle with the assumptions of mediocrity.
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In the habitable zone, surface water must be at least partially ________ in phase.
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Conducted in 1953, the ________ experiments were designed to show what types of complex molecules might have formed in the Earth's primitive environment.
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An extraterrestrial observer would pick up the strongest radio signals when
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A) X-ray wavelengths.
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In Drake's equation, which of the following is the closest estimate for the number of stars that are formed in the Milky Way Galaxy?
A) a star a day
B) a star a month
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Which type of molecules, vital to our life, were found to have survived a fiery descent to Earth on meteorites?
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B) DNA
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How long ago did multicellular life forms appear in the fossil record?
A) 4.5 billion years ago
B) 3.8 billion years ago
C) one billion years ago
D) 63 million years ago
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What important molecules of life did Miller and Urey brew up?
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Thanks to the far-flung Voyager and Pioneers, knowledge of our presence has now spread out over 30 light years.
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The water hole lies between 18 and 21 cm in wavelength in the radio spectrum.
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Earth-like planets have been observed outside our solar system orbiting in the habitable zone.