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- This shows the "solar corona," or outer
- portion of the Sun's atmosphere.
- It can stretch up to several million miles
- away from the sun. The corona is most
- easily seen during total solar eclipse
- when the main part of the sun is blocked
- out by the Moon. It is made
- up of very hot ionized gas reaching
- temperatures of 1 million degrees
- or more (the main part of the sun
- itself is only about 10,000 degrees.