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.
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 make it possible to see things that are too small to see with the naked, unaided eye.
No, gas is typically invisible to the naked 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.
Through a microscope, you can see tiny objects that are too small to be seen with the naked eye, such as cells, bacteria, and other microorganisms.
With the naked eye or any normal domestic aid - no.