Yes, but ONLY in ideal conditions, so realistically, no.
yes
Earth does not need a telescope, look down.
no because its far away
Yes, but you need really clear skies to see it.
Yes, the planet Mars is visible to the naked eye.
Yes. Even on slightly cloudy nights it is possible to see Jupiter with the naked eye.At the moment, Jupiter can be seen to the SW of the Moon and is clearly visible without binoculars.
The universe could have remainded unknown
Yes. Mars has been known since ancient times, long before the telescope was invented.
it is a comet that can been seen with a (naked eye) meaning without a telescope.
No the "planet" sun is in the other side of the world when its night. and its a star not a planet. --------------------------------- The son is not even a polanit. --------------------------------- HAHAHHAHAHA
Venus is one of the planets that is visible without a telescope. The planet has been known since antiquity. Galileo was the first astronomer to study Venus through a telescope.
Easily, if it's above the horizon. When it's up, it's one of the brightest things in the sky... at its brightest, it's third (with the Moon and the Sun being second and first respectively).