Anything that is too far away or doesn't emit enough light. No planetoid can't be seen with the naked eye. Most stars, even the closest ones, can't be seen with the naked eye, since they are too faint to be seen - the stars that you do see have an above-average brightness.
Comets - such as the ones in the Oort Cloud - can't be seen even with telescopes, unless they happen to come fairly close to us. The farthest known galaxies can be seen with large telescopes, but the individual stars cannot be seen. Etc.
Cities can be seen from space.
It doesn't have one. The NGC numbers are used to describe objects in outer space - as seen from Earth. Nor are individual objects in our Solar System included, as far as I know.
Some objects in outer space that can damage the earth could be the following: Asteroids Sun Particles Rocks from other planets Space bombs Fire Other objects flying around in space
have you not seen a photo of the earth taken from space? its just a haze around the earth.
meteroite
Earth!
they can be yes.
The sky is the apparently hemispherical region of space above the earth's horizon that includes the clouds and all the extraterrestrial objects as seen by human observers.
it is making scientist create objects to go out and study it
You can't see "space". You can see objects in space, but space itself is not visible.If you did wish to observe objects in space, a telescope would help you to do so.
Objects in space that can only be viewed from earth becouse of reflected light energy are said to be
Planets, moons, asteroids, artificial satellites.