In spiral galaxies, open clusters are largely found in the spiral arms where gas densities are highest and so most star formation occurs, and clusters usually disperse before they have had time to travel beyond their spiral arm.- Rights of Man (Wikipedia)
Rights of Man (1791), a book by Thomas Paine, including 31 articles, posits that popular political revolution is permissible when a government does not safeguard the natural rights of its people. Using these points as a base it defends the French Revolution against Edmund Burke’s attack in Reflections on the Revolution in France (1790).