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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Upper Elementary Science - II
3.19 The Sun

The Sun is at the center of our solar system. Our Sun is a big star, a huge, spinning ball of hot gas and nuclear reactions that lights up the Earth and provides us with heat. The Greeks called the Sun "Helios"; the Romans called it "Sol."

Distance from the Earth: Our sun is a medium-sized yellow star that is 93,026,724 miles (149,680,000 km or 1 Astronomical Unit) from the Earth.

The Earth is closest to the Sun (this is called perihelion) around January 2 each year (91.4 million miles = 147.1 million km); it is farthest away from the Sun (this is called aphelion) around July 2 each year (94.8 million miles = 152.6 million km).

Temperature: The Sun's core can reach 10 to 22.5 millionF. The surface temperature is approximately 9,900F (5,500C). The outer atmosphere of the Sun (which we can see during a solar eclipse) is up to 1.5 to 2 million degrees. At the center of big sunspots the temperature can be as low as 7300 F (4300 K, 4000 C). The temperature of the Sun is determined by measuring how much energy (both heat and light) it emits.

Directions: Answer the following questions.
Q 1: The Earth is closest to the sun every year in the month of

Q 2: The sunspots are regions on the surface of the sun whose temperature is
7300 F
12,000 F
9000 F

Question 3: This question is available to subscribers only!

Question 4: This question is available to subscribers only!

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