Theories suggesting that UAPs can be explained by ordinary, mundane, or conventional phenomena, objects, or processes, without invoking exotic or extraordinary explanations.

Sub-theories proposing that UAPs are manifestations of natural phenomena, such as atmospheric effects, celestial objects, or poorly understood geological processes.

Micro-theories suggesting that some UAP sightings can be explained by optical artifacts, illusions, or other visual phenomena that create misleading or misinterpreted images.

Micro-theories proposing that certain UAP reports may be attributed to celestial objects or phenomena, such as planets, stars, comets, or meteors.

Micro-theories suggesting that UAPs could be explained by meteorological phenomena, such as weather balloons, cloud formations, or atmospheric optical effects like mirages or light pillars.

Micro-theories proposing that some UAP sightings may be related to geophysical phenomena, such as earthquakes, volcanic activity, or other geological processes that can produce unusual aerial phenomena.

Sub-theories suggesting that UAPs are the result of any numnber of human activities, technologies, or creations, whether contemporary or historical.

Micro-theories suggesting that UAPs could be secret or classified projects, aircraft, or technologies developed and operated by national governments or military organizations.

Micro-theories proposing that some UAPs may be associated with extra-governmental entities, such as intelligence agencies, black budget programs, or unacknowledged special access projects.

Micro-theories suggesting that UAP phenomena could be related to collaborative or cooperative projects between different national governments or international organizations.

Micro-theories proposing that certain UAPs may be advanced technologies, vehicles, or artifacts developed by private companies, corporations, or commercial entities.

Theories proposing that UAPs are the products of hidden, ancient, or technologically advanced Earth-based civilizations or non-human entities residing on Earth, often in secluded or inaccessible locations.

Sub-theories proposing that UAPs may be associated with ancient or proto-human civilizations that have survived and evolved in hidden or isolated locations on Earth.

Sub-theories suggesting that UAPs could be the products of secretive, technologically advanced human civilizations that have "broken away" from mainstream society and operate in a clandestine manner.

Sub-theories proposing that some UAP sightings may be related to cryptids, unidentified humanoid creatures, or other mysterious beings that are the subject of folklore and cryptozoology.

Sub-theories suggesting that UAPs could be associated with ancient "gods," extraterrestrial beings, or advanced entities that have become stranded on Earth and continue to influence human culture and consciousness.

Theories suggesting that UAPs are spacecraft, probes, or manifestations of advanced extraterrestrial civilizations visiting Earth from other planets, star systems, or galaxies.

Sub-theories proposing that some UAPs may originate from within our solar system, such as from other planets, moons, or asteroid belts.

Sub-theories suggesting that UAPs could be visitors or probes from other star systems within our galaxy, engaging in interstellar travel or exploration.

Sub-theories proposing that some UAPs may have origins in other galaxies, implying advanced capabilities for intergalactic travel and communication.

Sub-theories suggesting that UAPs could originate from unknown or unexplored regions of our own space-time continuum, such as from the far future or distant past.