H-alpha (HÎ±) is a specific deep-red visible spectral line in the Balmer series created by hydrogen with a wavelength of 656.28 nm, which occurs when a hydrogen electron falls from its third to second lowest energy level.herefore, the H-alpha line occurs where hydrogen is being ionized. The H-alpha line saturates (self-absorbs) relatively easily because hydrogen is the primary component of nebulae, so while it can indicate the shape and extent of the cloud, it cannot be used to accurately determine the cloud's mass.
Seven Years War (1756-1763) The Seven Years War was the first global conflict. It had two main fronts. The first, in Europe, was the hostility between Prussia and Austria, still simmering after the War of the Austrian Succession , which expanded through alliances to include all of Europe.
French and Indian War/Seven Yearsâ War, 1754â63. The French and Indian War was the North American conflict in a larger imperial war between Great Britain and France known as the Seven Yearsâ War. The French and Indian War began in 1754 and ended with the Treaty of Paris in 1763. The war provided Great Britain enormous territorial gains in North America, but disputes over subsequent frontier policy and paying the warâs expenses led to colonial discontent, and ultimately to the American Revolution.