cyanobacteria
SY-an-oh-bak-TEER-ee-uh
Definition
Microscopic, photosynthetic bacteria that were the first organisms to produce oxygen as a byproduct of photosynthesis, fundamentally altering Earth's atmosphere.
Etymology
Derived from the Greek 'kyanos' meaning dark blue and 'bakterion' meaning small staff or rod, referencing their characteristic blue-green pigmentation.
In the news
Although the provided text focuses on tidal dynamics, cyanobacteria are essential context for Earth's deep history because their oxygenation of the atmosphere directly influenced the planet's rotation rate over geological time.
For roughly a billion years of Earth’s deep past, the Moon’s ocean tides may have slowed the planet while a Sun-driven atmospheric tide sped it up, holding the day near 19 hours — but the rocks preserve a hypothesis, not a stopwatch
Read the full article ↗Space Daily