And what were the dominant terrestrial species at said time? Would there even be any? I have zero idea of what’s the expected survival rate of an iPhone in the fossil record, but I like to imagine a giant sloth stepped on one once and we are none the wiser.
Alternative title:
“Assuming the timeline is stable and time travel is possible, but no evidence is ever found until its invention, what would be the earliest acceptable time period for time-travel tourism, and the latest cut-off point no one would be allowed to go to?”
A phone in a region with rock or ice flow might be grinded down into fine sand within hundreds of years. A smartphone touching lava will be burned to crisp within minutes
A Nokia 3310 on the other hand would survive all of these without a scratch. 🙃
If they dropped just one piece of future tech, the chances of any archaeologist ever finding it is infinitesimally small even if it could survive indefinitely. They haven’t dug up every inch of the earth’s surface. The stuff they find is the stuff that was common enough for them to have a decent chance of finding it.
I know you updated the post and what you’re really interested in is any tech they dropped not surviving, but I wanted to point out that “cell phones” would be useless with the infrastructure. They would be better off bringing radios or Star Trek-like communicators which transmit directly from one to another.
I was actually thinking of tourists taking photos in the past with cameras, but I found that a smartphone would be more realistic.
Ah, yep. So more like they bring their multi-function communication / information / documentation / entertainment devices with them. Heck, they may even use those devices for the time-travel itself. And then when they get to the ancient past, they pay no attention to the scenery and just watch reruns.
Can’t tell precisely since there are conditions, that might conserve a piece of technology to the point that it’s still going to be recovered and recognized as OOPART.
I guess that a million years or further is relatively safe bet, but even that isn’t granted.
No idea.
Hawking threw a party once to see if any time travellers would turn up.
