Both clusters are actually more distant than the Coalsack so are seen through it rather than against it .
The brighter and closer cluster NGC 4609 lies 10 arc - minutes away , and both clusters are near the centre of the dark Coalsack Nebula .
Both clusters are actually more distant than the Coalsack Nebula so are seen through it rather than against it .
The brighter and closer cluster NGC 4609 lies 10 arc - minutes away , and both clusters are near the centre of the dark Coalsack Nebula .