Who regulates markets where investments are traded?

The one who regulates the market is the Federal Government.

Explanation:

The US has federal system, in which some of the powers are given to the federal government, and others are given to the states. Congress, and the other two branches of the federal government, can only exercise those powers given in the Constitution. The powers of Congress are enumerated in the Constitution, and Article I, Section 8 specifies the power of the Congress to "regulate commerce among the several states" as well as regulate commerce with foreign nations and to regulate commerce "with Indian Tribes."

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.

good question. i'll be looking into that. (this is a joke sir)