Assignment 6 Compltete Test.

Rank the stars based on their surface temperature from highest to lowest. {Ans: -A blue white dwarf star -Sun -An orange main-sequence star -A red supergiant star}Compared to a low-luminosity main-sequence star, stars in the lower left of the H-R diagram are... {Ans: Hotter and smaller in radius}In the late 1800s, Kelvin and Helmholtz suggested that the Sun stayed hot due to gravitational contraction. What was the major drawback to this idea? {Ans: It predicted that the Sun could shine for about 25 million years, but geologists had already found that Earth is much older than this.}Nuclear fusion of hydrogen into helium occurs in the... {Ans: Core}Listed following are events or phenomena that occur during either the part of the sunspot cycle known as solar minimum or the part known as solar maximum. Match these items to the correct part of the sunspot cycle. {Ans: Solar Maximum: -Occurs about 11 years after a solar maximum (on average) -Solar flares are most common -Auroras are most likely in Earth's skies -Sunspots are most numerous on the Sun -Orbiting satellites are most at risk Solar Minimum: -Occurs about 5 to 6 years after a solar maximum (on