The good news, discovered circa 2040.
Some ancient and now long vanished race of aliens constructed portal network across the Milky Way. Even better they were obligate gardeners and part of their heritage is a vast assortment of life bearing worlds.
The bad news:
1: The liquid that ran in their veins was down around the boiling point of oxygen and they had only intellectual interest in hellworlds like Earth (they did fiddle with Mars for a while to see if sunshades could cool it down to Titan circa 2,000,000,000 BP temperatures but gave up on it as a bad job).
Their portals (which, heck, are wormholes why not) connect systems that were interesting to them, not hellworlders. As a side effect of that, while there is no reason they could not have hauled the mountain-massed portals down into inner systems, they generally didn't. Portals tend to be several AU out from the local star, beyond the frost line, and sadly, humans do *not* have 1 g forever ships. In fact, while what's available in 2040 is better than what we have today, it's not remarkably better. Pack a lunch, it will take a while.
2: It's been two billion years: even for stars whose brightness doesn't evolve quickly, that's enough time for some interesting changes in planetary orbits.
Most of the alien relics are too battered to work. Many are completely enigmatic. A few are comprehensible to us, the way a cave man would figure out uses for a Swiss Army knife, and those things are interesting enough that there's a market for them.
I see a lot of robotic exploration in this future.
Some ancient and now long vanished race of aliens constructed portal network across the Milky Way. Even better they were obligate gardeners and part of their heritage is a vast assortment of life bearing worlds.
The bad news:
1: The liquid that ran in their veins was down around the boiling point of oxygen and they had only intellectual interest in hellworlds like Earth (they did fiddle with Mars for a while to see if sunshades could cool it down to Titan circa 2,000,000,000 BP temperatures but gave up on it as a bad job).
Their portals (which, heck, are wormholes why not) connect systems that were interesting to them, not hellworlders. As a side effect of that, while there is no reason they could not have hauled the mountain-massed portals down into inner systems, they generally didn't. Portals tend to be several AU out from the local star, beyond the frost line, and sadly, humans do *not* have 1 g forever ships. In fact, while what's available in 2040 is better than what we have today, it's not remarkably better. Pack a lunch, it will take a while.
2: It's been two billion years: even for stars whose brightness doesn't evolve quickly, that's enough time for some interesting changes in planetary orbits.
Most of the alien relics are too battered to work. Many are completely enigmatic. A few are comprehensible to us, the way a cave man would figure out uses for a Swiss Army knife, and those things are interesting enough that there's a market for them.
I see a lot of robotic exploration in this future.