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From time travel to space exploration, science fiction has produced some of the best movies ever made. The genre, which dates back to near the very beginning of cinema, not only helped stretch our imaginations, but it gave us predictions into what the future might look like. And if you love sci-fi, we rounded up seven of the best movies that you can buy on Blu-ray.

Most of the films listed are available on Amazon, with free two-day shipping for Prime Members. If you’re not a Prime Member, click here to sign up for a free 30-day trial (the membership will cost $12.99 a month after the trial ends), which gets you access to markdowns on movies,...