There’s no actual evidence that space exists
We’ve been able to study ondes from very far, people who went into space and returned and probes who report from other planets and astral bodies and even from outside our Solar system.
the earth is a globe
In the Classical Era, scholars already knew that Earth was round and they didn’t have our sophisticated tools.
the earth is millions of years old
Radioactive dating, evolution, history, archaeology, etc. Plenty scientific fields would have to be utterly debunked for YEC to be true; given that these fields proven themselves true in other applications, YEC is certainly false.