The type of research design which compares various participants at several points in time (no longer than 6 years apart) to examine age-related differences and changes is called a

Cross-sectional research

Explanation:

Cross-sectional research: The cross-sectional research or study is also referred to as prevalence study, transverse study, and cross-sectional analysis.

This is one of the types of observational studies that examine a representative subset, population data, at a specific time. It includes people who belong to a different group but shares few characteristics like, educational background, socioeconomic status, and ethnicity.

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.

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