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.
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.
Jupiter is a planet that has over 60 satellites and rings that are not visible.
You can see satellites orbiting. If you go on a clear night to somewhere which is far from city lights, you will sometimes see dots moving across the sky - these are satellites reflecting sunlight.
Yes, the space station crosses the sky in a similar manner as other satellites. It is visible to the naked eye and can be seen as a bright moving light passing overhead. The space station orbits the Earth approximately every 90 minutes, so it may be visible several times in a single night.