On October 21, 2003, a photograph of the nocturnal sky was taken and revealed a possible 10th planet in our solar system: Eris. Unfortunately scientists came then to the conclusion that Eris and also Pluto could no longer hold the status as planets and were called dwarf planets from this point.
On October 21, 2003, a photograph of the nocturnal sky was taken, where almost 2 years later, in January 2005, evidence was raised that there might be a 10th planet at the borders of our solar system: Eris, located in the Kuiper Belt and named after the Greek godess of discord.
D. Beimborn, A. Maedche, and B. Mueller. Procedings of the 41. Annual Conference of the Gemran Gesellschaft für Informatik (Informatik 2011), Lectures Notes Informatics (LNI P-191), page 419-420. (2011)
A. Maedche, A. Hotho, and M. Wiese. Data Warehousing and Knowledge Discovery, Second International Conference, DaWaK 2000, London, UK, volume 1874 of LNCS, page 258-264. Springer, (2000)