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Correct!
As solar flares hit Earth's upper atmosphere, the particles glow in bright colors visible from Earth. You are more likely to see auroras when there are lots of sunspots.
Size: groups can be as large as 50,000 miles in diameter
Temperature: 39,200 degrees F
Parts: the darker, cooler umbra and the hotter, brighter penumbra
Frequency: heaviest every 11 years
Characteristics: cooler areas on the surface of Sun, appear less bright in visible light, and are strong sources of ultraviolet and X-ray radiation
Significance: used to measure rotation of Sun
Solar flares are explosions on the surface of the Sun that occur near sunspots. This type of solar activity causes:
Sunspots look dark in visible light because:
smoke comes out of them
their surroundings are so bright
the Sun's surface is burned
Correct!
The darker center is about 3,000 degrees F cooler than the rest of the sunspot. The center is called the umbra (Latin for "shadow"), and the lighter, hotter area around it is called the penumbra.
Our Sun is the only star where sunspots appear.
Fact
OR
Fiction
?
Fiction
Many stars get sunspots; only then we call them "starspots."
“
Looking directly at the Sun for more than a fraction of a second can lead to blindness. The Sun and its spots can only be safely viewed with filters designed for the purpose.
„
Mordecai-Mark MacLow, astrophysicist