Yes, Thiomargarita namibiensis and Epulopiscium fishelsoni- are up to half a millimetre long and are visible to the unaided eye.
http://en.wikipedia.org/wiki/Thiomargarita_namibiensis http://en.wikipedia.org/wiki/Epulopiscium_fishelsoni
no not with the naked eye
You can't see bacteria with the naked eye because they are too small to see that way.
Bacteria are visible. The plaque on your teeth, or such foods as cheese is mostly bacteria, and you can see it. Though, these are millions of bacteria in a clump, and you can only see the clump, not the individual bacterium. So, if you are looking at one bacterum, only the largest bacterium can be seen with the naked human eye, since they are single-celled organisms. However, for most bacterium, you need visual enhancers, such as a microscope, to see a single specimine, because most types of bacteria are too small for the naked human eye.
Not with the naked eye, but with a microscope, yes.
cannot
it is possible to see some constellations without the use of a telescope, but not all
Ofcourse,It is not possible with a naked eye but you can sure see it when you do with a hi fi telescope.
Very small. So small, that you can't see it with the naked eye. [It's bacteria.]
It's unlikely you will see many more than you could with the naked eye, however, depending on the magnification, it could be possible to see Neptune which is not visible with the naked eye.
It make it possible to see things that are too small to see with the naked, unaided eye.
When you look at your blood with the naked eye all you see is red liquid. This is all anyone sees with the naked eye.
If you're looking to see individual cells, yes. Large colonies can be seen with the naked eye.