In the last three years, nathan has experienced a failed marriage, the loss of a job, and bankruptcy. when he develops a serious health problem, he seems to have completely given up and is making little effort to follow his doctor's instructions to get well. nathan has developed a pattern known as

Learned helplessness

Explanation: Learned helplessness is the mechanism in which an individual believes or is aware about the that he/she will not be able to escape from the painful or unpleasant situations or environment because they have no control over the events or stimuli.Thus, the person is aware about the his/her helpless situation.

The situation mentioned in the question states about the learned helplessness of Nathan. Mental condition of Nathan has become serous issue because of the unpleasant events happened in his life .

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.