00:01
This question wanted us to rank the following in terms of fraction of the milky way's mass they represent.
00:07
So it wants to know about stars in the bulge, stars of the halo, stars in the disk, and dark matter.
00:12
So i rank them in order.
00:14
So stars in the bulge are the smallest.
00:16
Next is stars in the disc, then stars in the halo, then dark matter.
00:20
So stars in the bulge are confined to the center bulge in the milky way.
00:22
This is a dense region, but it's a small region.
00:25
So there's lots of stars in this region, but it's not a very big region, so they don't have as much mass because the region isn't big enough.
00:32
So stars in the disk are more dense than the halo, but they're confined mostly to the spiral arms...