What is the peristerum?

What cause a person walk forward? Are there minerals on planet Jupiter? When was the Apollo space program founded? Where is the sun's energy produced? When is the moon full in August 2012? What does the inertia of the planets affect the space in gravity? What happens to a large star when it runs out of fuel? Why doesn't the gas planets just float away? What are nicknames for the sun? How fast does the cornea cloud after death? Who was the first person to go to other planets? What size is Venus compared to earth? What is found in the Oort cloud or Kuiper Belt? Why does the moon not revolve and rotate at same time like earth does as it goes around the sun? What was the name of the first American artificial satellite launch? What are the most important elements to consider when designing a sustainable building? What are the tiny indentations on a disc called? What planet was to the farthest from the sun until 1999? How far can a rocket shoot with 900 gallons of fuel? Which planet rotates fastest?