News for hackers. Stuff that matters.

A comment on Water found on a potentially life-friendly alien planet. Parent comment

Re:Water found on a potentially life-friendly alien planet by isostatic on Wednesday September 11, 2019 @06:17PM (#20945389)
accelerating at 1G to the mid point, then decelerating at 1g, will mean you’ll get there in about 15.8 ship years, or 115 earth years.

Spend twice as long on boats though (32 years) and you can do about 10,000 light years.

[ Parent | on HN ]
Re:Water found on a potentially life-friendly alien planet by vonmoltke on Wednesday September 11, 2019 @06:55PM (#20945691)
A constant acceleration of 1g would cause the ship to hit c in about one ship year.
[ Parent | on HN ]
Re:Water found on a potentially life-friendly alien planet by Thrymr on Wednesday September 11, 2019 @08:01PM (#20946103)
The ship will never hit c.
[ Parent | on HN ]
Re:Water found on a potentially life-friendly alien planet by nealabq on Wednesday September 11, 2019 @09:54PM (#20946965)
If the ship travels tens of billions of light years will it eventually be traveling away from it's starting point at greater than c due to the dark-energy expansion of space itself? Or will the ship just red-shift more and more but never disappear from an observer with a very good telescope who stayed home?

And what if you drove your ship straight into a super-massive black hole?

[ Parent | on HN ]
Re:Water found on a potentially life-friendly alien planet by isostatic on Thursday September 12, 2019 @09:03AM (#20950921)
One theory of the far future (Big Rip) is eventually nearby galaxies will be receeding faster then light, then stars, planets, then even atoms.

There's a short story about the Big Rip

https://web.archive.org/web/20080725045740/http://www.solari...

[ Parent | on HN ]