There's a nice video on the future of space travel in todays APOD - the film is a few years old, narrated by Carl Sagan
https://apod.nasa.gov/apod/ap230326.html
later - sorry, it turns out that the film was made well after Sagan's death, with speech from the audio book of his Pale Blue Dot, with the permission of his family.
https://en.wikipedia.org/wiki/Wanderers_(2014_film)
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The Future of Space Travel - Carl Sagan video.
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