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 galaxy is about 2.5 million light-years from Earth. (A light-year is the distance that light travels in a vacuum in a yearabout 5.88 trillion miles [9.46 trillion km].) It is estimated to be about 160,000 light-years in diameter and to contain more than 2 trillion stars.