No, the objective moral questions are the same that they were 50 years ago and the moral response is still the same. Science may advance but what is right and what is wrong is still the same.
Your response to the Church's history on aliens was:
'Once upon a time many people thought that the world was flat and that if you went too far you would fall off.'
I took that to mean the Church's teaching on aliens as heretical was somehow related to the flat-Earth belief and thus nonsense. Thus I named it 'Modernism personified.'
I am now trying to figure out the above response. It could mean that the Church teaching is still the same even if 'science' has advanced. I would agree that the Church's teaching cannot change, does not change, and remains the same. As for 'science may advance' well what advances has it made on the subject of aliens? Are you suggesting science has somehow advanced that aliens exist? If so we would all love to hear about it. https://philos-sophia.org/scientism-ideology/
Here is what Wolfgang says if it doesn't open:
A great deal of what we call science is scientism,
which is to say that it’s ideology driven.
What we are facing here is not “science,” properly so called, but a kind of “religion” you can say. It’s something people are passionate about. It’s something they defend, and it is something for which they are willing to attack.
So a great deal of our so-called science is ideology. And, in fact, it is the ideology which is presently manifesting in all the different cultural domains of our civilization, including the political. [and Pouch's Modernism]