Which is recognised as the most massive bacterium so far discovered, reaching up to .75mm in length and large enough to be visible to the naked eye?
Largest organisms Until "P. ellipsoideus" replaced it, the largest individual fruit body came from "Rigidoporus ulmarius". "R. ulmarius" can grow up to , tall, across, and has a circumference of up to . The largest known species of bacterium is "Thiomargarita namibiensis", which grows to in diameter, making it visible to the naked eye and a thousand times the size of more typical bacteria. The largest virus on record so far is the "Pithovirus sibericum" with the length of 1.5 micrometres, comparable to the typical size of a bacterium and large enough to be seen in light microscopes. It was discovered in
Naked eye light pollution is absent, stars as faint as +8 might be visible. The angular resolution of the naked eye is about 1′; however, some people have sharper vision than that. There is anecdotal evidence that people had seen the Galilean moons of Jupiter before telescopes were invented. Uranus and Vesta had most probably been seen but could not be recognized as planets because they appear so faint even at maximum brightness; Uranus' magnitude varies from +5.3 to +5.9, and Vesta's from +5.2 to +8.5 (so that it is only visible near its opposition dates). Uranus, when discovered in 1781, was