Answers edited by Aryan V

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• What are some of the measurement devices we use to describe the weather?
  
• How do scientists estimate the number of galaxies in the universe?
  
• How do atmospheres on planets get created, especially other ones besides earth?
  
• What give galaxies their different shapes?
  
• The population of town A increases from 1,346 to 1,500. In the same period, the population of town B increases from 1,546 to 1,800. What is the percent increase in population for town A and for town B? Which town had the greater percent of increase?
  
• Question #3cda5
  
• What causes an emission nebula?
  
• Question #15fe4
  
• Question #2c311
  
• What is the coldest planet? Hottest?
  
• Can you find the square root of #-1/2# ?
  
• How do the basic galaxy types differ in shape, stellar content, and interstellar matter?