It is known that the Galilean moons of Jupiter, in their apparent brightness (3-5m), are quite accessible for observation with the naked

It is known that the Galilean moons of Jupiter, in their apparent brightness (3-5m), are quite accessible for observation with the naked eye. However, for the first time they managed to be seen only through a telescope. Why?

1. Jupiter blocks the light of nearby satellites with its light.
2. If you try to block Jupiter with a dark screen (artificial eclipse of Jupiter), you can see them.
3. You can see satellites only if they are in a favorable location.

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