Answers edited by Ed Hitchcock

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• What makes a nebula planetary and what makes a nebula diffuse? Is there any way to tell if they are Diffuse or Planetary just by looking at a picture? What are some Diffuse Nebulae? What are some Planetary Nebulae?
  
• Question #3cc11
  
• How many grams are in 5.67 ng?
  
• How powerful are today's telescopes compared to some of the first used to look at the heavens?
  
• Question #88ca9
  
• Question #5ced9
  
• Question #a52b1
  
• What are the receiving chambers of the heart and what are the discharging chambers?
  
• How do you find the maximum area of rectangle with 80ft perimeter?
  
• What is #(pi)/4 # radians in degrees?
  
• Why does earth's distance from the sun change?
  
• What is a planetary nebula made of?
  
• What percent of 33.5 is 21?
  
• Question #28721
  
• Given that y varies directly with x, and x = 15, y = 9, how do you write a direct variation equation that relates x and y?
  
• How strong is the force of gravity on earth?