The "eye" on Jupiter is a nickname for a large storm which has been raging on the planet for over 300 years. It is better known as "the great red spot".
It is a storm.
no
No.
Mercury, Venus, Mars, Jupiter, and Saturn can be seen with the naked eye.
The planet with a big red eye is Jupiter
Jupiter does not have an actual "eye" like a human or a hurricane does. However, a storm on Jupiter called the Great Red Spot is a massive anticyclonic storm system that has a characteristic "eye" appearance in its center, which may be what you are thinking of.
only Jupiter
Jupiter
No planet has been called the red eye. However, Mars is often referred to as the Red planet and Jupiter has a giant red spot.
some time when you do see it jupiter looks like a star
Jupiter is visible to the naked eye and has been known for thousands of years. So no satellite was needed to find Jupiter.
Jupiter is visible to the naked eye. It has been known since mankind first started stargazing.