External link to 1. Where is most of the interstellar gas in our galaxy located? What is its chief constituent? 2. Do

1. Where is most of the interstellar gas in our galaxy located? What is its chief constituent? 2. Do

1.       Where is most of the interstellar gas in our galaxy located? What is its chief constituent? 2.       Do radio telescopes magnify anything? If not, why are larger and larger ones being built? 3.        List the three ways in which radio waves from space originate.

External link to Planets are always small compared with stars because otherwise a. the rotation of the planets would.

Planets are always small compared with stars because otherwise a. the rotation of the planets would.

Planets are always small compared with stars because otherwise a. the rotation of the planets would cause them to disintegrate b. the great mass of the planets would cause them to be pulled into their parent star c. the great mass of the planets would prevent them from being held in orbit and they would escape d. the planets would be stars themselves

External link to 1. What are the origins of the helium found in the universe? 2. To what event in the history of the.

1. What are the origins of the helium found in the universe? 2. To what event in the history of the.

1.       What are the origins of the helium found in the universe? 2.       To what event in the history of the universe can the cosmic microwave background radiation be traced? Was the radiation always in the form of microwaves? If not, what happened to change the wavelengths of the original radiation?

External link to 1. Did the planets come into being before, during, or after the formation of the sun? 2. Would you..

1. Did the planets come into being before, during, or after the formation of the sun? 2. Would you..

1.       Did the planets come into being before, during, or after the formation of the sun? 2.       Would you characterize the most likely next phase of the earth’s history as fire or ice? 3.       Why is it reasonable to suppose that many stars besides the sun have planets orbiting them? Why does it seem unlikely that spacecraft from the earth will ever visit other planetary […]

External link to 1. . What kind of evidence supports the belief that molecules of various kinds, including some…

1. . What kind of evidence supports the belief that molecules of various kinds, including some…

1.       . What kind of evidence supports the belief that molecules of various kinds, including some fairly complex ones, exist in space? 2.       Are most galaxies smaller, larger, or about the same size as our galaxy? 3.       How can the rotation of a spiral galaxy be determined? Will this method work for all spiral galaxies?

External link to 1. How are galaxies distributed in the universe? 2. (a) How does the typical size of a galaxy…

1. How are galaxies distributed in the universe? 2. (a) How does the typical size of a galaxy…

1.       How are galaxies distributed in the universe? 2.       (a) How does the typical size of a galaxy relative to the typical distance between galaxies compare with the corresponding ratio for stars in a galaxy? (b) Which would you expect to be more common, collisions between galaxies or collisions between stars?

External link to 1. Is the cosmic microwave background radiation uniform in space? If not, what is the significance..

1. Is the cosmic microwave background radiation uniform in space? If not, what is the significance..

1.       Is the cosmic microwave background radiation uniform in space? If not, what is the significance of the variations? 2.       Suppose the spectral lines of distant galaxies were shifted toward the blue end. What would this suggest about the universe?

External link to 1. . What do you think ultimately becomes of the protons and neutrons knocked out of atmospheric…

1. . What do you think ultimately becomes of the protons and neutrons knocked out of atmospheric…

1.       . What do you think ultimately becomes of the protons and neutrons knocked out of atmospheric atoms by cosmic rays? 2.       Cosmic-ray primaries are mostly protons, but few protons are in the cosmic rays that reach the earth’s surface. Why? 3.       What traps cosmic rays in our galaxy?

External link to 1. How does the mass of all the interstellar matter in our galaxy compare with the total mass of its

1. How does the mass of all the interstellar matter in our galaxy compare with the total mass of its

1.       How does the mass of all the interstellar matter in our galaxy compare with the total mass of its stars? 2.       Why are radio-astronomical studies of the distribution of hydrogen in the universe of greater interest than studies of the distribution of other elements?

External link to 1. . (a) What is the observational evidence in favor of there being a great deal of dark matter in..

1. . (a) What is the observational evidence in favor of there being a great deal of dark matter in..

1.       . (a) What is the observational evidence in favor of there being a great deal of dark matter in the universe? (b) Where is the dark matter located? 2.       Why is it unlikely that dark matter consists of brown dwarfs, burned-out white dwarfs, and/or black holes? Why is it unlikely that it consists of neutrinos?

External link to In a commensal relationship: a) one species pollinates the other. b) neither species benefits or is.

In a commensal relationship: a) one species pollinates the other. b) neither species benefits or is.

In a commensal relationship: a) one species pollinates the other. b) neither species benefits or is harmed, but the community itself benefits. c) one species provides nutrients, usually cellulose, for the other. d) one species benefits while the other neither benefits nor is harmed. e) the “loser” has reduced reproductive output.

External link to 1. Describe a feature of tigers that renders their species susceptible to extinction. 2. What is the

1. Describe a feature of tigers that renders their species susceptible to extinction. 2. What is the

1.       Describe a feature of tigers that renders their species susceptible to extinction. 2.       What is the chief reason for the loss and impending loss of so many species? 3.       Why are ecosystem disturbances that involve the loss of species considered so devastating?

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