Neptune is visible from Earth at many times during the year depending on your location. It is not visible with the naked eye, so you will need a telescope.
As long as you stay on the Earth, Neptune is never visible without optical aid.
neptune does have visible rings around it
All of them, although Neptune requires a telescope.
As far as is known, Neptune has no artificial satellites.No object made on earth is in orbit around Neptune. If there is one there that was manufacturedby sentient, technologically sophisticated beings in some other place, it's not visible from earth.
no,no telescope has seen neptune
Neptune is the farthest planet from the sun and the smallest of the gas giants. It has a gravity that is very similar to Earth's. It is also a Great Dark Spot, which is a strong hurricane-like storm. Because Neptune is a gas planet, it does not have a definite surface. The visible "surface" of Neptune is a blue haze. Occasional clouds and storms are visible.
As seen from the earth is is not at all bright. It is the only planet which is not visible to the naked eye.
Neptune does not affect Earth.
We have no information about how often meteors strike the planet Neptune. It is almost certain that it happens, but Neptune is so far away that it would have to be an enormous asteroid striking the planet to be visible on earth, unless the Hubble happened to be looking at Neptune anyway.