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The brightness level perceived by the unaided human eye is referred to as "apparent magnitude." This scale measures the brightness of celestial objects as seen from Earth, with lower numbers indicating brighter objects. For example, a star with a magnitude of 1 is brighter than one with a magnitude of 6, which is near the limit of visibility for the average human eye in dark conditions.
The basic function of eye is to see the thing around us.
Saturn is visible in the sky to the unaided human eye and has thus been known from ancient times. This means no one person can be credited with its discovery.However, the first person to document the existence of Saturn's rings was Galileo in 1610.
Yes, its one of the planets that can be seen with the unaided eye, known to ancient people as being different from the fixed stars.
The limit of resolution for a light microscope is around 200 nanometers, allowing us to see individual cells and some organelles. The unaided human eye has a resolution limit of approximately 0.1 millimeters, so it can see objects down to this size without assistance.
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Millimeters can be used as a measurement for items smaller than one centimeter
One possibility is in term of -scopic or seeing. Macroscopic organisms can be see with the unaided eye. Microscopic organisms require a microscope or some other means of visual magnification.
A star's brightness as viewed by the unaided eye is measured using a scale called apparent magnitude. This scale quantifies how bright a star appears from Earth, with lower numbers indicating brighter stars. For example, a star with an apparent magnitude of 1 is brighter than one with a magnitude of 6, which is at the limit of what the average human eye can see under ideal conditions. Factors influencing a star's apparent brightness include its intrinsic luminosity, distance from Earth, and any interstellar material that may dim its light.
They are microorganisms, consisting of only one cell, and they are so small that they cannot be seen with the unaided eye. Some organisms are smaller than amoebas, but they are still very small.