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.
Details: If Earth is a pea of 6mm - 0.23'. Then Sun is a beach ball with a diameter of 66 cm or 26' then, UY Scuti, the biggest star know in our Galaxy, will be a huge orange sphere, three times larger than The Pentagon or 1,1 km - 0.7 miles in diameter. Not a solid sphere but a gaseous one, very, very, extremely rarefied ball of hot (around 3300 degrees) gas.