The Sun

Use each of the terms just once to complete the passage. The Sun is the largest object in our solar system. Its mass controls the motions of the planets. The center of the Sun is very dense. The high temperature at its center causes the solar interior to be gaseous throughout. The visible surface of the Sun is called the photosphere. It is the lowest layer of the Sun and is approximately 400 km in thickness. The average temperature is 5800 K. Above the visible layer is the chromosphere. It is approximately 2500 km thick and has an average temperature of 15,000 K. Without special feature, this layer is visible only during a solar eclipse. The top layer of the Sun's atmosphere is the corona. It has a temperature of about 3 million to 5 million K. Plasma flows outward from this layer at high speeds and forms the solar winds. It is made up of charged particles, or ions, which flow outward through the entire solar system. Cooler areas on the surface of the photosphere thatappear darker than the surrounding areas on the Sun sunspots A period of 22 years in which the number of sunspotson the Sun changes regularly and the Sun’s magnetic fieldreverses solar activity cycles Areas of low density in the gas of the corona fromwhich particles escape coronal holes Violent eruptions of particles and radiation from thesurface of the Sun solar flares Arc of gas ejected from the photosphere prominences Sun Cross-Section Label the diagram Convection Zone Radiation Zone Core What is Fusion? Where does it take place in the Sun? What is Fission? How is Einstein's theory of special relativity expressed? What does each letter stand for? What is the process that transfers the Sun's energy from particle to particle? Where does this process take place? What is the process that carries the Sun's energy the rest of the way to the Sun's surface? What carries the energy? How far, as a percentage, does the radiation zone extend to the photosphere?