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This site gives the story of the history of the universe and this page covers red giants.
A brief description of how Planet Hunting works. This site is part of Marshall Brain's HowStuffWorks.com. Description of how planets form. Definition of a planet.
For stars of less than 4 solar masses, hydrogen burn-up at the center triggers expansion to the red giant phase.
A written description of how the planets formed
An elementary quiz based on the position and orbits of the planets.
Read how spectroscopy is used to determine what makes up the atmosphere of planets
Details of how large planets have been detected around three other solar type stars. Understanding Doppler wobble aided by an exercise.
Instructions on how to make a giant prism
a selection of the "best images" of planets (minor planets etc, and instruments) from NASA.
Planet Science contains lots of great articles and activities in all areas of science plus some brilliant little games.
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