Space Daily August 30, 2026 • 04:30

The ocean looks like one vast sunlit body of water, but below about 600 feet there is too little light for photosynthesis, and below 3,300 feet sunlight disappears entirely—leaving much of Earth’s surface in permanent darkness. - Space Daily

Photosynthesis is generally confined to the upper 200 metres of the ocean, while direct sunlight disappears below roughly 1,000 metres, leaving most ocean water aphotic.

Seen from orbit, Earth looks like a blue world wrapped in one connected, sunlit ocean. That horizontal view hides a much sharper vertical division. Light is plentiful near the surface, too weak to po… [+10179 chars]

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The ocean looks like one vast sunlit body of water, but below about 600 feet there is too little light for photosynthesis, and below 3,300 feet sunlight disappears entirely—leaving much of Earth’s surface in permanent darkness. - Space Daily

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