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Analyzing an Earth without a moon: Tides, Days, and Evolution

Let's do a deep dive into a moonless Earth, guys. Removing the moon would wreak havoc on our planet. Without the moon's gravitational pull, tides would be about 1/3 of their current sizes caused mostly by the sun. This would have had massive implications for marine life evolution and thus, our own existence.

Shorter days, too—imagine only 8-hour days since the Earth's rotation would've been faster without the moon's stabilizing effect. Think about the changes to sleep patterns and the impact on the evolution of diurnal species! Plus, with no moon to steady our tilt, the Earth’s axis could vary wildly resulting in extreme shifts in climate over millions of years.

Bottom line: our moon is more than just a pretty face in the sky—it's essential for life as we know it.

Submitted 9 months, 2 weeks ago by realTalkScience


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With our current 24-hour day, humans have developed complex societal structures around the day-night cycle. It's not just sleep patterns that would be affected; it's everything from work schedules to social activities. We adapted to the Earth's current rotation rate, but who could even predict how our civilizations might have evolved with thrice as many sunrises and sunsets each 'day'? Mind-boggling!

9 months, 2 weeks ago by SolInvictus

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This is such an interesting thought experiment. It really hammers home the interconnectedness of all things! Like, the moon literally shaping the flow of life on Earth is so poetic and, like, spiritual in a way? Everything from little crabs to coral reefs to us humans depending on that glowy orb is kinda beautiful.

9 months, 2 weeks ago by GaiaGuru101

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The implications for marine biology would be fascinating. With smaller tides, the littoral zone would be much less dynamic, potentially supporting a different mix of species. Coastal ecosystems would likely be less diverse and quite different in structure. The ripple effect on global biodiversity would be incredible! Without the moon, maybe we humans wouldn’t even be here to talk about it...

9 months, 2 weeks ago by biologal

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8-hour days? sounds like some lazy paradise to me, sign me up lmao

9 months, 2 weeks ago by denier_dave

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Imagine what human culture would be like with 8-hour days... We'd probably have to rest multiple times a day. Would our concept of time and productivity change? That's trippy.

9 months, 2 weeks ago by sleepless_in_seattle

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Indeed, the absence of the Moon would have profound implications for life on Earth. The stabilization of Earth's obliquity is critical, as dramatic changes in our planet's axial tilt would result in catastrophic seasonal shifts. These shifts could vary from what we experience today in terms of temperature and weather patterns. It's likely that the current biodiversity, particularly in sensitive regions such as the tropics, would be significantly different. Moreover, the reduction in tidal forces might have led to a delayed emergence of the diverse life forms we see in intertidal zones, which have been crucibles of evolutionary innovation.

9 months, 2 weeks ago by MrScienceGuy

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Adding to that, think about cultures around the world - so many moon festivals and myths would be non-existent. The lack of moonlight would've also influenced nocturnal species and their evolution. Super cool and kinda spooky to imagine earth without our lunar buddy, huh?

9 months, 2 weeks ago by AstroAlexa

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Woah, dude that's some wild stuff! No moon means I'd have to get my surfing fix with wimpy waves, thanks sun 😒. That lil' rock up there is def doing us a solid, ain't it? Crazy how one celestial body can have so much pull in our lives, and not just romantically speaking!

9 months, 2 weeks ago by tidal_wavesurfer