Moon lunar dust astronomy polar craters far side radio

Human activity can erode the Moon’s astronomy advantages

The Moon’s permanently dark, cold polar craters suit infrared telescopes, while its far side is shielded from radio emissions from Earth. Increased human activity can spread lunar dust and erode these observing advantages unless the dust’s spread is limited.

Public sacrifice reinforced Aztec rule

Aztec rulers publicly sacrificed warriors from conquered states. These sacrifices displayed the ruling class’s claim to divine authority and deterred rebellion, helping hold together a loosely organized empire.

Some conquered lowlands lacked grass for horse armies

Steppe nomads could travel far on horseback, but mountains and deserts blocked some routes. Some conquered lowlands had too little open grass to feed large horse armies. Nomadic rulers therefore often adapted to the richer settled societies they had conquered.

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Moon lunar dust astronomy polar craters far side radio

Human activity can erode the Moon’s astronomy advantages

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