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.
There are deep dust lanes (appearing dark) and a few regions of intense star formation (in pink), and there are small, dwarf satellites (like the one on the upper left) being gobbled up. And much like our own galaxy, this one is about 100,000 light years in diameter. All of this, for a distant galaxy, we can learn just from a glance through a telescope across the Universe, some 30 million light years away. Indeed, many galaxies have some of these similarities to our own.