In the latest Ducktales episode we find out that:

Della Duck got lost in outer space due to a cosmic storm.

I don't know what a cosmic storm and don't think we have that in our universe. The Duckverse also seems to be different than our universe in that spacetravel is way more common.

What else do we know about the Duckverse in regards to outer space?

All comics, shows etc are canon.