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Home Q & A Board Science-Related Homework Help Physics Astronomy
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dfysb54w dfysb54w
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6 years ago
Sound waves in the early universe are more technically known as ________.
 
  Fill in the blank(s) with correct word

Question 2

Most of the dark regions on Mars visible from Earth are:
 
  A) features like the Valles Marineris.
  B) lava flows from active volcanoes.
  C) mountainous regions.
  D) the seasonal growth of vegetation on the planet.
  E) volcanic planes like the lunar maria.

Question 3

The Ptolemaic model of the universe
 
  A) explained and predicted the motions of the planets with deferents and epicycles.
  B) is the basis of our modern cosmology.
  C) could not account for the stellar parallax observed by Hipparchus.
  D) describes the orbits of the planets as being ellipses, not circles.
  E) always kept Mars and Mercury between the Earth and Sun.

Question 4

The interstellar ________ absorbs light from stars and makes them appear fainter and redder than they otherwise would appear.
 
  Fill in the blank(s) with correct word
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sammholdersammholder
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6 years ago
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dfysb54w Author
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#2
6 years ago
All correct!
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#3
6 years ago
Happy to help
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