Astronomi već dugo znaju za "Westerlund 1", ali tek prije oko 5 godina smo prvi put vidjeli sve zvijezde u njoj, zato što smo onda imali infracrvene detektore, koji mogu proći kroz prašinu u galaksiji smještenu između Zemlje i skupa.
Astronomers have known about Westerlund 1 for a long time, but only about five years ago, did we first get a glimpse of all the stars in the cluster, because that's when we had infrared detectors that could peer through the dust in the galaxy that's situated between the Earth and the cluster.