Tens of billions of potentially habitable, Earth-size planets in our galaxy

Re:Tens of billions of potentially habitable, Earth-size pla... by gliese1337 on Wednesday November 06, 2013 @02:05PM (#6684683)

You've seen it. 210.52 years. The passengers on the ship should only experience 65.7 years- (210.52)sqrt(1-.95^2). Hence the famous twin paradox- the twin who goes on a relativistic trip comes back younger than the one who stayed behind. What you calculated was how much time would pass on Earth for a trip that took 100 years and 100 light-years from the perspective of the people on the ship, which is not generally what people mean when they say that a star is 100ly away.

[ Parent | on HN ]

Re:Tens of billions of potentially habitable, Earth-size pla... by thangalin on Wednesday November 06, 2013 @03:50PM (#6685417)

I found the source of my confusion.

The post I replied to stated, "I don't know how much time would have passed on Earth though." You stated I calculated "how much time would pass on Earth."

The OP was wondering, "if a person on a ship visited a star 100ly away, how much time would have passed on Earth when they returned?"

However, the OP was wondering about time frames in terms of a warp drive, rather than a conventional almost-light-speed drive. Take my upvotes. :-)

[ Parent | on HN ]