... to collect light as possible. The lens has a convex (curved outward) shape making it thicker in the middle than the edges. This thickness slows the light waves as they pass through the glass, bringing the waves into focus at the same time. Reflecting telescopes: Reflection refers to the use of a primary mirror to reflect the light back to a focus instead of refracting ... vapor and other gasses. Venus doesn't have a detectable magnetic field, but it does have a surface temperature of about 730 k because the atmosphere causes a runaway green house effect and traps the heat inside. (D) Ma...

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

... , a fluid element which is at higher pressure than its surroundings will expand until the pressures are equalized, and the speed at which this occurs is the speed at which sound waves travel from one side to the other. For the Sun this is about five minutes. Acting against the pressure forces is gravity. Each piece of fluid exerts gravity towards itself ... takes perhaps hundreds of thousands of years for the energy released in the center to make its way to the surface. Conduction Conduction is the way in which metals transport heat. Conduction is not important in most normal stars becau...

• Word Count: 2570
• Approx Pages: 10
• Has Bibliography
• Grade Level: High School