... the color of starlight. He believed that the wavelength of the light of a star that is moving away from us (Earth) would be lengthened which would make the light more red. The Doppler Effect does occur, but not in the way that Doppler described it. The typical velocity of a star traveling towards us is so much smaller than the velocity of ... causes a runaway green house effect and traps the heat inside. (D) Mars - When Mars is closest to Earth, it is easy to observe and can even be spotted by the naked eye. Polor caps make an obvious feature on Mars and they are very bright. Mars also ...

• Word Count: 3183
• Approx Pages: 13
• Grade Level: High School