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Mercury, Venus, Mars, Jupiter and Saturn can all be seen with the naked eye. So no one knows when a person looked into the sky and saw them.

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Q: When was the first planet discovered besides Earth?
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Related questions

What was the first planet that was discovered besides earth?

Jupiter


What was the first planet discovered besides earth?

Jupiter


First planet tobe discovered?

Earth...


What was the first planet discovered?

No planets have been discovered using a microscope.


Where and when was oxygen discovered?

Oxygen was discovered by the very first species on planet Earth.


Who discovered your planet?

please type in the planet name. Earth (if it is) was known by our ancestors. The first modern human beings on the earth.


When was earth planet discovered?

When humans evolved and realized they were standing on something.


What was the first planet earth discovered?

well the moon... but that's not really a planet so logically we found the closest planets first.


Why is Neptune's?

THIS PLANET IS THE FIRST TO BE DISCOVERED BY MATH THIS PLANET IS THE FIRST TO BE DISCOVERED BY MATH


VWhen was the earth discovered?

There really isn't a date the Earth was discovered, as humans have known of the existence of the planet since the species was first capable of symbolic thought.


When first discoveed the planet earth?

Earth's exact age is indefinite but it is millions of years old. Humans discovered it when they had their first concious thought.


How first discovered the planet earth?

No one discovered Earth. Humans have been here since the beginning of our existence. Earth's exact age is indefinite but we know it is millions of years old.