 Here we're zooming in to the giant nebula NGC 3603, a prominent star-forming region about 20,000 light-years away. As we said earlier, it is the largest H2 region in the galaxy, and it's the last H2 region we'll cover in this segment. The star cluster HD97950 is nested within the nebula. It contains three of the most massive and luminous stars known. Ultraviolet radiation and violent stellar winds from these stars have blown out an enormous cavity in NGC 3603's gas and dust enveloping the cluster. These winds have created the unobstructed view we see here.