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Yeah, it's wild how everyone goes "aliens" when the expansion of the universe sets the vast majority of it as inaccessible without FTL travel, our own signals of life haven't reached very far yet, and the same underlying tech to travel FTL would also mean traveling in time.
So we have things flying around in formations similar to our own tech and behaviors but seemingly more advanced and showing considerable interest in humans.
Time travel at least deserves to be on the discussion table as much or more than aliens.
Time travel to the past is orders of magnitude more unlikely than alien life existing at the same time as us. We know interstellar travel is physically possible, just very difficult, while our current knowledge of physics shows that time travel to the past is physically impossible.
I think it's more likely that if these objects are extraterrestrial that could be uncrewed drones meant to perform basic science/reconnaissance. It's even possible the civilization that launched them is long dead due to the distances involved and that's why they aren't contacting us.
That said, I also wouldn't assume that we're uninteresting. Any form of life that demonstrates intelligence is probably rare, so simply observing us out of curiosity would make sense too.
You misunderstood.
The issue isn't whether it's possible to travel interstellar.
It's that the rate at which the universe is expanding means that even if you could travel at the speed of light, the majority of the observable universe could never be visited. Traveling slower than the speed of light, and even more is permanently inaccessible.
Additionally, we've only been generating 'interesting' signals that could be detected for only around 100 years.
Assuming those signals could still be read somehow at a decent signal to noise ratio maximally far from us, that's still only around 10,000 star systems within a 100 light year radius around us.
Given the speed at which less than light speed interstellar travel would occur plus the time to reach us after receiving an interesting signal, and you are talking about maybe around a 30 light year radius that's practically the range at which any alien life would have received a radio signal from Earth and been able to arrive to check it out.
Given credible sightings go back to the mid 20th century, that reduces the practical range to more like a 10 light year radius to get a signal and come check it out using conventional interstellar travel.
There's like 30 star systems in that range.
We're currently using spectroscopy to try and find possible bio signatures.
Which our planet has had for anyone looking, for oh, several million years longer than our radio broadcasts, which have largely stopped