It doesn't reach 5000kmh until 26km altitude[0], but the highest geese have been reported is 9km altitude[1], so I would assume it would only be in danger of en

It doesn't reach 5000kmh until 26km altitude[0], but the highest geese have been reported is 9km altitude[1], so I would assume it would only be in danger of encountering geese at speeds lower than 5000kmh. (Still likely to be at pretty fast speeds though.) [0] https://en.wikipedia.org/wiki/Skylon_(spacecraft) https://en.wikipedia.org/wiki/Skylon_(spacecraft) [1] https://en.wikipedia.org/wiki/Canada_goose https://en.wikipedia.org/wiki/Canada_goose