Osteopenia refers to bone density that is lower than normal peak density but not low enough to be classified as osteoporosis. Bone density is a measurement of how dense and strong the bones are. If your bone density is low compared to normal peak density, you are said to have osteopenia.steopenia refers to bone density that is lower than normal peak density but not low enough to be classified as osteoporosis. Bone density is a measurement of how dense and strong the bones are. If your bone density is low compared to normal peak density, you are said to have osteopenia.
The Milky Way is the second-largest galaxy in the Local Group, with its stellar disk approximately 100,000 ly (30 kpc) in diameter, and, on average, approximately 1,000 ly (0.3 kpc) thick.
Allrightythen Tim, first of all, you don't even have a picture of our galaxy. Your first pic is M31, the Andromeda galaxy, and your second one is M33, the pinwheel galaxy. They are our nearest large niegbors, and are both part of the Milky way's cluster. Andromeda is bigger than the Milky Way, at 150,000 light years across, and M33 is smaller at I believe 75,000 light years across. Our galaxy is appx. 100,000 light years across. The bright spot at the center of the galaxy is teh galactic bulge, which contains many old, bright stars.