How do economists measure the success, or shortcomings, of the economy?

GDP is a useful indicator of a nation's economic performance, and it is the most commonly used measure of well-being. ... The failure to account for the costs imposed on human health and the environment of negative externalities arising from the production or consumption of the nation's output.

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.