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.
God's power in Numbers. The Milky Way galaxy we live in roughly contains 100 billion stars. Astronomers have also estimated that the number of galaxies in the observable universe is 200 BILLION! The current diameter of the observable area is about 93 BILLION light years. The width of the ENTIRE universe (the parts we can and cannot see) is bigger still. In comparison, the width of a typical galaxy is only 30,000 light-years.