The specifics might be unknown but they are actually irrelevant because death is simply a universal feature of Existence
Everything dies as the Second Law Of Thermodynamics has an absolutely one hundred per cent record in respect of this
Existence is a state of being rather than a physical thing as such so it cannot die but everything else does
So the future is not always a blank slate as some things will definitely happen regardless of anything else
My own death for example is an absolute certainty - there is no way I will achieve immortality as this mind in this body
It is therefore not speculation to make a claim about a future event that will definitely happen but actually has yet to
You accuse me of being an objectivist but from my own perspective you are being even more so in refusing any truth statements at all about the future
And therefore can your objectivist mindset accept as inevitable that you are going to die - that the Sun is going to die - that the Universe is going to die
Entropy is a feature of any system and when there is insufficient energy to do any more work then every thing within that system - including itself - dies
This is not a religious or philosophical truth but a scientific one and one that is therefore relatively easy to demonstrate :
After the Sun has reached a state of maximum entropy - another five billion years - life on Earth will become extinct from that point on
Even if some of our descendants actually manage to colonise another world that will be merely delaying the inevitable - no more no less
So regardless of what your objectivist mind thinks of these words of mine the Second Law Of Thermodynamics will go on slowly destroying life like it always has
My own mind which is a combination of subjectivist and objectivist - like all functioning minds including yours - sees death as just a point on the spectrum of Existence
Even after I die I will still exist in some form as something will always exist in some form or another - though by then it will not matter and it doesnt really matter now