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Review questions
1 · Why does the Sun shine?
2 · What makes the stars different from one another?
3 · How is the Sun inside and how do we know that?
4 · How is energy transferred from the Sun to Earth?
5 · Which layer of the Sun is visible during an eclipse?
DID YOU KNOW THAT…
...the Sun contains 99,9 % of the Solar System’s mass?
In other words, if we gather all the planets and their moons, and asteroids, and comets, they become just a thousandth part of the Solar mass.
DID YOU KNOW THAT…
...the Solar System travels to 220 km/s around the Milky Way’s center and, besides its high speed, it takes 220 million years to orbit once around the Galaxy? This period is called a galactic year or cosmic year.
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