Can people answer these questions please.

The main sequence of stars contains approximately ________% of all known stars.

Mars, Jupiter, and Saturn do something odd. Once a year, or so, they change the direction of their wandering, causing a lopp in their movement. This phenomenon is call ___________.

The _________ model of the solar system places Earth at the center of a gigantic sphere on which the Sun, Moon, and planets were attached.

The measurement of the total amount of energy a star radiates per second is called a ________.

I couldn't find these on google or I wouldn't have posted.
do you play guitar/bass?
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