I caught that, too, but it’s pretty clear he just misspoke – it’s a well informed interviewer at work here working stuff out for a lay audience.
Yeah, he uses the correct terms elsewhere, and I’m sure he knows the difference (and would be mortified if the error were pointed out to him). But the whole ‘galaxy’ vs. ‘solar system’ confusion crops up everywhere, and it’s a measure of how widespread it is that even a well-informed science-enthusiast can unwittingly slip into making this mistake.
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