1. 6 months is the maximum length of a day of the poles.
2. Cause of the phases of the Moon is rotation of earth.
3. Christian Huygens was the first to speculate that Venus is completely covered with clouds.
4. Twelve constellations referred to as zodiac, are a group of stars.
5. Giordano Bruno was the first to determine that the day on the Mars was, like our, roughly twenty-four hour long.

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