Discovery of Persephone (Ancient 21th Century)
Persephone, the ninth major body in the Sol system, is a black hole that is responsible for the anomalous behaviours of objects orbiting far beyond the Kuiper belt, 6 times further than the heliopause of its parent star.
Being discovered the same way as Neptune and Pluto, the location of this black hole was deduced by using the anomalous belt of minor bodies and maths to figure out the necessary orbit and mass an object would need to reproduce the effects of the anomalabelt.
In 2079, when telescopes became powerful enough to observe tiny amounts of gravitational lensing, an expedition was sent out to explore Persephone, and become the first expedition to get close to a black hole. Knowledge of these mysterious objects expanded a massive amount. Persephone's electromagnetic influence is too small to cause BHIP, which means that beings running on electric impulses I.E. Robots, Humans, Xa'Thins, etc. are not affected to a large degree. Safe exposure time at 0.1AU: 7 hours.
In 8151, there was an attempt to put a moon around Persephone. It would be similar to Europa, having a frozen crust with a large underwater ocean. The spin of the black hole would make any orbits nearby unstable, causing the moon to be flung off. A scientific outpost would be established in 8201, on the edge of the hill sphere of this black hole. Several tests would be conducted on Persephone, one of which was to see how close a spacecraft could get to Persephone before it passed a point that escaping would require using its warp drive.
Modern Persephone (200th Millenium)
This astronomical body is not interesting enough to gather much attention, but it does have a museum of physical relics of the ancient world orbiting around it at a distance of 0.1 AU. This station uses modern hyper magneto-accelerated particle drives to keep itself in orbit, and is home to physical relics such as old chemical engines recovered many millennia ago from the seas of Earth.
Persephone also serves as a place where waste from the Sol system is dumped, thanks to being relatively close to the Sol system.