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.
[ The Universe: Big Bang to Now in 10 Easy Steps ]. The mini galaxy is less than 600 light-years wide; for comparison, the Milky Way is 150,000 light-years across. Astronomers think MACS0647-JD may eventually combine with other small galaxies to create a larger whole.