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I think this could all be done with 19th century technology, so I would expect it to be developed then if solar power was the main energy source. …

Nothing stops you from going as fast as you want given enough time, fuel and distance, but these practical considerations mean there's a huge difference in the amount of technology and cost between travelling …

I suggest laser propulsion for the acceleration phase. The reason stealth is hard when accelerating is waste heat. Any method of propulsion will produce lots of it, and heat is easy to detect. However …

Paragliders A few others have suggested gliders of one kind or another, but I think paragliders have a lot to recommend them. The wing is high above the user, so it won't interfere with the user's ow …

Another reference point is the YouTube channel Primitive Technology. He works much more rigorously, using only tools he makes himself from what's available in his environment. … From these examples, I would conclude that if they don't have to worry about food and if they have access to a suitable knowledge base, then a single person could probably reach a roughly iron age technology …

Here is another way, which could be combined with other answers: make the planet cold, either permanently or because it's in the middle of an ice age. The idea is that only the equatorial region is re …

It could be an extra-solar object like 'Oumuamua. That would explain why it hadn't previously been detected. A sky survey might pick it up, but since it's heading almost directly towards us on a hyper …

A second answer: enormous tides. Your planet has a large moon like Earth does, but it's a lot closer, or in an elliptical orbit (perhaps as a result of a planetary collision a few millions of years ag …