アルベルト・アインシュタインのインスタグラム(alberteinstein) - 4月20日 22時01分

WATCH: Physicist Brian Greene talks time travel. Not the kind of time travel you encounter in sci-fi, but real time travel – the kind that's written into the laws of physics and understood using the time dilation equation. Watch to learn more about how and why our perceptions of space and time are not fixed, but relative.

@brian_greene111 @worldscifest #yourdailyequation #timetravel #backtothefuture

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