... . He used spectral analysis to demonstrate this theory, analyzing the composition of reflected light in terms of its elemental makeup . Hodges notes that this analysis allowed Newton to envision: "light and visibility of objects as a result of the rather mechanical movement of a host of miniscule particles or "corpuscles" of light through air, from object to observer, at the speed of about 168,000 miles per second". In more than one way Newton ... 's theories of light interrelate with his theories of gravity. In turn, Newton's gravitation formula pertains from every aspect ... ...

• Word Count: 1150
• Approx Pages: 5
• Grade Level: Undergraduate

... , plants inside them experience zero gravity in relation to the spacecraft. Sometimes, in long-term experiments, artificial gravity is used, and created by either the rotation of a plant chamber or by changes in speed and direction. Roots of plants show positive geotropism whereas shoots, stems, leaves, etc., will show negative geotropism. Positive geotropism is growing towards the source ... of gravity; negative geotropism is plants growth away from the source of gravity. In addition, although geotropism was thought to be simply gravity's effect on a plant hormone, Auxin, which is obser...

• Word Count: 363
• Approx Pages: 1
• Has Bibliography
• Grade Level: Undergraduate