I am the Egg-moon.

Dr. Who has always been pretty far-fetched but usually fairly free of elementary errors. Tonight, the Moon was an egg which hatched into some dragon-like creature.

Well okay. There are many hollow-moon theories that could work with that idea. The moon doesn’t have enough mass to account for its size, if it’s all made of the same rock as the surface. There are serious thoughts that it might have big hollows inside, perhaps caused by bubbles of trapped gas when it formed. Nobody knows for sure, that’s why it’s so open to being accused of being a spaceship (no engines, but we’ll let that slide for now because tonight it was a dragon egg).

If the moon was a rock-coated egg then it’s perfectly possible that the contents would have a lower mass density than the rocks on the shell. So far, so good. But if the inside was a fluid could we not tell?

Maybe not. Albumen and yolk are very viscous and since the moon always shows the same face to Earth, it effectively rotates on its axis once every 28 days. It’s not rotating very fast and the fluid inside is viscous and it’s been there a long, long time. If the fluid now rotates in sync with the outer shell, it might not be so easy to detect.

A long incubation period might also be credible given the surrounding temperature and the size of the thing being incubated.

The moon being a dragon egg isn’t yet beyond the bounds of credibility. The story works so far.


The moon increased its mass by several billion tons very suddenly. How? If there is an embryo growing inside then it must be fed by a yolk sac. As the embryo grows, the yolk diminishes but the total mass of the system does not change. Nothing goes in and nothing comes out during this egg-moon incubation so how can it increase in mass by billions of tons – and how can it do that very suddenly?

I could believe that the distribution of mass changes as yolk becomes embryo but that would not be sudden and would not result in an increased mass. It might well result in orbital wobbles and rotational changes so the moon would then sometimes show its other side to Earth. The billions of tons of sudden extra mass though, that breaks the credibility for me.

As for the badger-sized single-celled prokaryote with jointed legs and a mouth full of teeth… no. A spider based on prokaryote cells, well it’s a stretch but not totally incredible, but a single cell that size, a single cell with legs and teeth… nope. Don’t believe it for a moment. Especially since it can live and be fast-moving in vacuum, it shuns the light and prefers the sub-zero shade, and it spins webs. Especially the webs. What was it hoping to catch on the moon? That one was right off the wall.

Finally, the egg hatched and the moon was gone. Then it was back. Exactly as it was before, in the same orbit. How? Well, the creature laid another egg before it left. Another one. The same size. A newly-hatched creature immediately laid an egg the same size as the one it just hatched out of. That has got to sting. A lot. it would also require the creature to put more mass into the egg than it has in its body, since the shell of the original egg disintegrated.

I like Peter Capaldi’s Doctor. Much more un-human than the last few. Much more like William Hartnell’s original.

The storylines though, need a lot more thought put into them. A gradual shift in mass within the moon resulting in it rotating in the sky, threatening to lose orbit (in or out, either would be bad) and signs that it’s breaking up would have been enough. You could even have sudden shifts in mass as the embryo starts moving.

No need to magic up billions of tons of mass from nowhere. What’s going to be next, a space walrus?



21 thoughts on “I am the Egg-moon.

  1. “What’s going to be next, a space walrus?”

    Dr Who already did a space whale in that godawful ‘Spitfires in Spaaaaaaaace’ episode. And a flying shark in another.

    The writers aren’t even trying any more, are they?


  2. I am very pleased to say that I do not have the foggiest idea what this thread is all about as I have no idea what a “Dr. Who” is or where he is made manifest.
    I intend remaining in this blissful state.


    • Most versions of Dr. Who between the first one (1960s) and this last one have not been much worth noticing. He is finally a curt curmudgeon once again!

      You cannot, however, have escaped the Daleks. Nobody escapes the Daleks.


  3. They should have let Courtney talk about chicken eggs πŸ˜‰

    There were some other good ideas in the story: the three women (triple goddess) making the decision, that humanity collectively turned the lights off (so true unfortunately) and the fact the Doctor refused to act as saviour, putting the responsibility firmly in Jiminy Cricket’s court.

    I really didn’t like the spiders but then I wouldn’t. Plus their colouring was a bit too ‘Iron Sky’ (from what I could see from behind my fingers) – Germ(an) spiders.


    • I did like the idea that the ‘Earth Hour’ crowd couldn’t get people to turn the lights off… but tell them there’s a dragon hatching out of the moon and hey presto!

      A testament to human gullibility if ever there was one!


  4. I really quite liked the idea of the moon being an egg, I have to tell you I am not one of those people who cares to think about whether it’s possible or accurate or not, I just really liked the premise.
    I suppose being thick has it’s bonuses on occasion, it means I am left unbothered by the practicalities. πŸ˜€


      • What you missed was the question at the beginning – “Why the normal gravity?” Well, that was answered; the Moon has put on a bit of weight… okay, don’t ask the second question: “How?”

        For all its faults (not least the horribly intrusive “background” music), I enjoy the programme, exploring the ideas of an alien travelling through space and time, picking up the occasional (usually human) sidekick. Then there is the idea of a Tardis – bigger on the inside than the outside (wish my wardrobe was like that).


        • I missed that one, you’re right. They had to have normal gravity because of b=dget, no doubt, but surely there was a better way around it than magical mass?

          I also enjoy ther program and always have, even when I realised that William Hartnell’s first meeting with the Daleks had no more than three Daleks in it. The rest were just painted on the walls.


  5. Personally, I am more worried about the vast quantities of oil and gas being extracted from Earth’s interior. What is going to happen to all of the gaps that this is leaving? Will Planet Earth collapse one day?


    • I still subscribe to the cheese theory put out by the first man and dog on the moon and the robot washing machine that defends it.

      However, I have to consider the possibility of the Toast King and Insanity Prawn Boy.

      All things are possible in science.


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