"Co to svítí na jižním nebi?"

Translation: What is that shining in the southern sky?

[tompw89]

Why is it "co to" and not just "co"?

[kacenka9]

"To" here is what we can call a 'filler'. Not really needed but something most people would say. Kind of like in english you would add IT. - What is IT that shines......