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What would Planet Earth be like if there was no moon?

What would Planet Earth be like if there was no moon?
Laraine Stokes from Greater London (Age 55+)


One Response

  1. I think there would be a lot of big physical effects but I’m a biologist so my answer will relate to the biology. The moon has a big impact on the biology of the planet. For example, without a moon there would be no tides, or if there were because of the sun they would only be very slight, so all those creatures that depend on the tides would not be the same.

    Creatures that live in the intertidal zone have adapted to be able to cope with drying out when the tide is low. It may be the case that without a moon and no tides creatures might never have needed to have adapted in this way and have made that transition to land so there may never have been any terrestrial animals!

    Also, lots of marine animals have body clocks that synchronise with the lunar cycle. The clocks tell them when to feed and when to rest but most importantly they often tell them when to breed. In the sea synchronised mass spawning is very common. This is when all the animals release their eggs and sperm at the same time in the same location to try and maximise the chance of fertilisation. Without the important moon to set these clocks synchronised spawning might not be possible.

    It’s also possible that other 28 day cycles, such as the menstrual cycle, might originate from lunar cycles in our evolutionary past so should we have evolved as far as being on land we might reproduce in a very different way too.

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