Yeah I’m pretty sure you are
The correct answer is:
An understanding of the number and size of leftover planetesimals in the early solar system.
The giant-impact hypothesis proposes that the Moon was created out of what was left of a collision between Earth and an astronomical body the size of Mars, around 4.5 billion years ago, in the Hadean eon. The heavy bombardment was a period when leftover planetesimals hit planets during the solar system's first hundred million years.
European leaders might have diverted attention away from internal dissent and problems by rallying their nations to the cause of war.
The nations of Europe were struggling to adjust to societal changes brought on by industrialization. There were workers strikes and rising socialist movements that caused internal tensions between the ruling classes and the working class. In some parts of Europe, such as the Austro-Hungarian Empire, nationalistic fervor by different ethnic groups was causing unrest within their borders also. Solving a nation's internal problems posed great difficulties. It was easier to point to other nations as the great threat and problem to their people's security. It seemed to leaders that "prosecuting an active foreign policy" (as some Austrian leaders put it) was a way to suppress internal domestic troubles.
