If you can figure out a way to apply thrust that doesn't require you to lug mass with you and throw it out the back of your spacecraft you will open up the stars to exploration. If not the rocket equation will wreck your plans every time.
If there are creatures who could live longer than that, perhaps by hibernating or just having really long lifetimes, space exploration is feasible with slow craft.
75k years of reliable operation for complex machines operating in a hostile environment is a different story. This includes organic life. You can't just bottle everything up and wake up thousands of years in the future, you will be under constant bombardment by high energy particles, micrometeorites, and the relentless cold vacuum of space with no access to new raw material or energy for almost the entire trip.
If you can make that kind of trip the question becomes why bother? You could have used the same technology (actually a much easier version of the tech since you will have access to external resources and don't need to attach enormous engines to get it moving and then stopping at the destination) to use the almost unlimited space in your home solar system instead.
Unless your sun is literally about to explode it is hard to make the argument for the incredibly difficult and long journey to a neighboring solar system.
If you can figure out a way to apply thrust that doesn't require you to lug mass with you and throw it out the back of your spacecraft you will open up the stars to exploration. If not the rocket equation will wreck your plans every time.
Why?
75k years in geological timescales is nothing.
If there are creatures who could live longer than that, perhaps by hibernating or just having really long lifetimes, space exploration is feasible with slow craft.
75k years of reliable operation for complex machines operating in a hostile environment is a different story. This includes organic life. You can't just bottle everything up and wake up thousands of years in the future, you will be under constant bombardment by high energy particles, micrometeorites, and the relentless cold vacuum of space with no access to new raw material or energy for almost the entire trip.
If you can make that kind of trip the question becomes why bother? You could have used the same technology (actually a much easier version of the tech since you will have access to external resources and don't need to attach enormous engines to get it moving and then stopping at the destination) to use the almost unlimited space in your home solar system instead.
Unless your sun is literally about to explode it is hard to make the argument for the incredibly difficult and long journey to a neighboring solar system.
Longer than that if you are constantly decelerating.
And exactly that if you're talking about Voyager 1, which is on a ballistic trajectory.
Less than that if you're going faster too. What's your point?