Energy supplied by fusion maintains the pressure that balances the inward crush of gravity.
What is the Suns structure? Insert TCP 6e Figure 14.3 The protonproton chain is how hydrogen fuses into helium in Sun.
Sunspots Are cooler than other parts of the Suns surface (4000 K)
Are regions with strong magnetic fields Loops of bright gas often connect sunspot pairs.
Insert TCP 6e Figure 14.21a unannotated The number of sunspots rises and falls in an 11-year cycle. Insert TCP 6e Figure 14.21b unannotated The sunspot cycle has something to do with winding and twisting of
the Suns magnetic field. Magnetic activity also causes solar prominences that erupt high above the Suns surface.
Charged particles streaming from the Sun can disrupt electrical power grids and can disable communications satellites. Aurora Borealis
What causes eclipses? The Earth and Moon cast shadows. When either passes through the others shadow, we have an eclipse. Lunar Eclipse
When can eclipses occur? Lunar eclipses can occur only at full moon. Lunar eclipses can be
penumbral, partial, or total. Solar Eclipse When can eclipses occur?
Solar eclipses can occur only at new moon. Solar eclipses can be partial, total, or annular. Why dont we have an eclipse at every new and full moon? The Moons orbit is tilted 5 to ecliptic plane. So we have about two eclipse seasons each year, with a lunar
eclipse at new moon and solar eclipse at full moon. Summary: Two conditions must be met to have an eclipse: 1. 2.
It must be full moon (for a lunar eclipse) or new moon (for a solar eclipse). AND The Moon must be at or near one of the two points in its orbit where it crosses the ecliptic plane (its nodes).
Predicting Eclipses Eclipses recur with the 18-year, 11 1/3-day saros cycle, but type (e.g., partial, total) and location may vary.
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