[stolenmerch]

Exactly, there are numerous reasons other than it's not possible.

1.Time-travel will never become possible.

2.Time-travel becomes possible. Their time travel capabilities are inadequate to visit us.

3.Time-travel becomes possible. They do not wish to visit us.

4.Our archiving and preservation techniques are inadequate. Our message does not reach the future.

5.Time travel becomes possible. They are willing and able to travel to the past. Our archiving and preservation techniques are adequate. The message has not been accessed in its future database.

6. Time travel becomes possible. They are willing and able to travel to the past. Our archiving and preservation techniques are adequate. We are not able to perceive or become aware of their visitation.

[carlmr]

7. Time travel becomes possible, however traveling back in time opens a new timeline and the old timeline exists in the past of the new timeline unchanged. So we observe the old version of the timeline, wile there's an alternate reality where guests attended the party and another future rebased on top of that history.

[AdamJacobMuller]

8. Time travel becomes possible. They are willing and able to travel to the past. Our archiving and preservation techniques are adequate. They aren't allowed to tell us they are from the future or meaningfully interact with us in ways which might change the timeline (temporal prime directive).

Also, rebasing the future makes me think of time travel as git history.

Imagine the merge requests and the fights inside them

MR #1: went back in time and killed hitler.

[maest]

9. Time travelers actually attended the party but somehow convinced Hawking to report 0 attendance.

[carlmr]

>Also, rebasing the future makes me think of time travel as git history.

That's what I thought about when I picked the word rebasing ;).

[sabbaticaldev]

this would be a very unlikely scenario where in our current timeline there are no time travelers but there are at least one in each new timeline. If that becomes true it might be the ultimate vacations/retirement plan, create a new timeline where you are the only timetraveler

[tmm84]

I'm big on #2 and #3 myself. I'm willing to accept that there are windows of time they can travel to with little risk (timelines, people, events, etc.). Also, the idea that proving time travel is possible by visiting people in previous times would be potentially dangerous or impossible (any uncontrollable variables lead to disbelief of individual).