With the naked eye, it is practically impossible - ancient astronomers identified them by their locations in the sky. However, Mars is visibly red-tinged, and Saturn slightly yellower than Jupiter.
With some magnification, you can see faint lines on Mars, and Saturn will show its rings at some times of the year.
Mercury, Venus, Mars, Jupiter, and Saturn can easily be seen with the naked eye. Visibility changes from year to year; you may want to look up information about specific planets, for specific months and years. For example, at the time of this writing (Oct. 2009), Jupiter can be seen after sunset, as a spectacularly bright star, high in the sky. It will set a few hours later.
The planets visible to the naked eye, from the brightest to the less bright are Venus, Jupiter, Mars, Saturn, Mercury.
Mercury, Venus, mars, Jupiter and Saturn can all be seen from earth. They look like bright stars with the naked eye.
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.
All of them. That's where they were discovered from. Only Neptune cannot be seen with the naked eye.
Mercury, Venus, Mars, Jupiter, and Saturn can be seen with the naked eye.
Mercury, Venus, Mars, Jupiter, and Saturn can be seen with the naked eye.
Jupiter nor Saturn were "discovered". They are visible with the naked eye and thus were known about since humans first looked up into the night sky.
The naked eye visible planets. Mercury, Venus, Earth, Mars, Jupiter and Saturn.
Jupiter, Mars, Venus and Saturn have been visible to the naked eye as long as mankind can remember.
Mercury, Venus, Mars, Jupiter, and Saturn can easily be seen with the naked eye. Visibility changes from year to year; you may want to look up information about specific planets, for specific months and years. For example, at the time of this writing (Oct. 2009), Jupiter can be seen after sunset, as a spectacularly bright star, high in the sky. It will set a few hours later.
The planets visible to the naked eye, from the brightest to the less bright are Venus, Jupiter, Mars, Saturn, Mercury.
Earth Venus Jupiter Mars Saturn Mercury
Mercury, Venus, mars, Jupiter and Saturn can all be seen fairly easily, appearing as bright stars. If you have very clear skies, very good eyes and know exactly where to look it is possible to just see Uranus. All of the planets have to be in the right place relative to earth to see them - no good if they are behind or in front of the sun.
Venus, Jupiter, Mars, Saturn, Mercury. Uranus is very faint but also naked eye visible on very dark nights, if you know just where to look, averted vision.
Mercury, Venus, mars, Jupiter and Saturn can all be seen from earth. They look like bright stars with the naked eye.
The planets Mercury, Venus, Mars, Jupiter and Saturn have been known since the Sumerians and Egyptians, and probably before that. They are easily visible with the naked eye. Currently, only Venus and Saturn are visible; Venus in the evening, and Saturn from midnight to dawn. Mars, Jupiter and Mercury are very close to the Sun just now, and very difficult to pick out in the twilight.