That's a nice one! :thumbsup:
The chain of seven (7) active star-forming regions, running from the upper-right to lower-left corners, of which the Orion association is the 2
nd, is one segment of the
9000 lyr long "Radcliffe Wave" (see 2
nd image). Do factor into account that the "first" active SFR in the UR corner (near the Vela SNR) is
500-1000 lyr below the galactic midplane, whereas the Orion SFR is
near the midplane, and the "third thru seventh" active SFRs running down towards the LL corner are all well
above the midplane... such that the "aqua-green circles" on the
first image are only projected-onto-the-galactic-midplane positions: