NASA’s TESS Spacecraft Triples Size of Pleiades Star Cluster - NASA Science

Utterly fascinating.

One of the key things that I took away is that these were known as "3 stars" at some point. Then were known as 3 clusters of stars. And now they have been identified as over 1,000 stars making up this object!

And that's culled from the nearly 10,000 that are near enough by the clusters to have been possibly part of it. 

10,000 stars we can see in one location! That just boggles the mind.  

https://science.nasa.gov/missions/tess/nasas-tess-spacecraft-triples-size-of-pleiades-star-cluster/