When they reflect the light from the sun or moon.
light emitted by the satellites
no
A satellite stops being visible when it moves into the earth's shadow.
One can find pictures of earth satellites on the NASA Visible Earth online website. NASA Visible Earth is a catalog of NASA images of our home planet, earth. The website "Geology" is where one can also find pictures of earth satellites.
The number of satellites visible in the sky at any given moment can vary widely, but typically, around 20 to 30 satellites can be seen with the naked eye under optimal conditions. This includes both operational satellites and defunct ones. However, the total number of satellites currently in orbit is over 3,000, with many more being smaller and not visible without the aid of telescopes or specialized equipment. Factors such as light pollution and the satellite's orbit also affect visibility.
Satellites carry cameras (visible light, infrared and ultraviolet)and radar. They produce very good images of the earth that can be studied.
it shows us nothing
I am not aware of any beacon lights on any satellites. I'm sure the International Space Station has some, for times when the Shuttle is coming in, but what purpose would they serve otherwise? Aircraft have anti-collision lights - to avoid airplanes crashing into each other at night. But satellites generally travel too fast for any visual cues to be useful - and satellites have very limited maneuverability anyway.
Yes, it is possible to see satellites from the ground with the naked eye. Satellites are typically visible during the early morning or evening hours when the sun's light reflects off them. They appear as moving points of light in the night sky.
They convert infrared radiation into electrical signals which is then converted into visible light.
The minimum number of operational NAVSTAR satellites required for global positioning coverage is typically considered to be 24. This number allows for at least four satellites to be visible from any point on Earth, enabling accurate triangulation and positioning. However, to enhance reliability and accuracy, the system often operates with more than 30 satellites in orbit.
Jupiter is a planet that has over 60 satellites and rings that are not visible.