Multiple choice

The visible yellow face of the sun is called

  1. Corona

  2. Photosphere

  3. Ionosphere

  4. Stratosphere
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The photosphere is the visible surface of the sun - a layer about 500 km thick where the sun's gases become thin enough for light to escape. It appears yellow and has a temperature of about 5,500°C. The corona (outer atmosphere) is only visible during eclipses, while ionosphere and stratosphere relate to Earth's atmosphere.

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