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Study Guide for Solar System Test (part 2) Test on February 6th Why do stars seem to twinkle? What is the difference between a red star and a blue star? What is meant by the phrase “the life cycle of a star”? How is our sun described in terms of heat and size? Why are constellations useful? Why do the star patterns we see in the night sky seem to move? Which planets are visible with the unaided eye (without a telescope)? Who was one of the first people to use a telescope to study the sky? Which star is most often used to help us find a direction and why? Because the light is traveling to our eyes from very far away A red star is a cool star, a yellow star is a medium hot star, and a blue star is very hot A star does not last forever, it has a beginning when it is formed, it shines for billions of years, then it begins to cool and finally “dies”. Our sun is a medium sized, medium hot, yellow star They act as landmarks in the night sky, and have been used for hundreds of years to help people find their way. They also helped people in ancient times keep track of the seasons, because different constellations could only be seen at certain times of the year. As the earth orbits the sun we see different parts of the galaxy and our position in space changes. It looks like the stars are moving, but actually it is the earth that is moving. Mercury, Venus, Mars, Jupiter, and Saturn. Galileo Galilei The North Star, or Polaris, is a star that always points north. Even though the earth moves, this star is always pointing North.