This topic will be like our word of the day (any word and it's definition then you can add a fact about it) but the difference is well, it's not Word of the 'day' anymore since it's not one word for day.
The challenge here is you cannot use dictionary to define the word. You need to define it using your own words based on how you understand it. But the fact can be researched.
So i'll start
Constellation
Meaning: A collection of stars that has a distinct recognizable pattern.
Fact: There are currently 88 modern constellations recognized internationally. Most of them originated from the Ancient times. In before times, The constellations were used by people to pinpoint their location. Also, most stars in most constellations do not really have a connection at all since they are really far apart.