Flail Chest (Definition) Flail chest is a life threatening medical condition in which multiple segments of the rib cage have been broken and are loosened. These segments cause severe bruising and damage to the lung. ...Read more.
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.
Distances measured in light-years include distances between nearby stars, such as those in the same spiral arm or globular cluster. One kilolight-year, abbreviated kly, is one thousand light-years (about 307 parsecs). Kilolight-years are typically used to measure distances between parts of a galaxy.