unless this individual has it sorted out), but journeying into the future is a somewhat different matter. A key aspect of Einstein’s space-time theory is that the flow of time is relative to the velocity at which the observer travels. As you move faster, time elapses more slowly, so if you managed to circle the Earth at light speed for just a month, you would come back to find that all your acquaintances are a complete 40 years older. Sadly, we lack the technology to reach light speed and venture into the future, but if you merely flew at a velocity matching Earth’s rotation, you might be able to “freeze” time, remaining perpetually in sunlight or shadow. Here’s what it would take to achieve that.
