Will be possible in the far future to use megascale engineering to create a ringworld around Earth?

I mean in the far future megascale be advanced enough to allow the construction of a ring world around Earth or around a low mass star( a red dwarf for exemple).

If yes, how big Earth would look from the ringworld?And how big and thick the ringworld would look seen from Earth?

How day and night cycles would be simulated?And how an Earth-like climate would be possible?

The ringworld would also function as an artifitial ring(however a ring-like space station would also have this feature), since earth don't have any rings unlike Saturn.The sky would be much more interesting to look at.

How the ringworld would look at night?Could the ring world have its own moon or moons?A hollow artifitial moon with little or no gravity?

Would a Halo ring be more realistic than a ringworld around Earth?

This is a halo ring:

posted over 6 years ago

user18428‭

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