Milly way galaxy 18. How are the large and small Magellanic Clouds interacting with our very own Milky Way Galaxy?
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19. How do the stars in the large and small Magellanic Clouds differ from the stars in our Milky Way?
20. What is known to be at the center of most galaxies?
21. What is dark matter? How can we detect it?
22. What is the best evidence for the existence of dark matter?
23. What is dark energy and how does it explain the expansion of the Universe?
24. How does the decrease of gravity among galaxies as they move away from each other cause an increase

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.

Anthracite is so hard and pure it is also referred to as a renewable resource metamorphic rock hot bituminous coal dirty fuel

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false