The original note, as written at the time
EARTH-METEORITE; OVUM SPERM EQUIVALENCE. What if the earth is like a giant ovum, and life got delivered here by a meteorite much like how an ovum gets fertilised by a sperm? I read somewhere that an ovum is one million times the size of a sperm. So if you matched the sizes maybe you could get a clear picture. The thing is, this might mean that the universe is like a giant womb.
Ongoing development
What if the earth is like a giant ovum, and life was delivered here by a meteorite much as an ovum is fertilised by a sperm?
The scale is the part that makes it worth thinking about. An ovum is something like a million times the volume of a sperm, so the ratio of the traveller to the vessel is extreme, and the traveller carries almost nothing. If the analogy holds at all, the interesting conclusion is that panspermia does not require a ship carrying life. It requires a very small payload arriving at a very large prepared body.
That reframing changes what to look for. Not a vessel, but a signature — an arrival event at a time when the body was receptive, which is a much narrower window than the whole age of the planet.
The last line of the note is the one that opens rather than closes the question: if the earth is an ovum, the universe is a womb. That is an analogy and analogies are not evidence, but they are good at generating questions that a hypothesis cannot. What would count as a placenta. What would count as a gestation period. Why would anything do this.
The honest position is that this is a way of looking, not a theory. The value of a metaphor in science is that it suggests an experiment, and this one suggests a specific one: look for a single arrival event, at a favourable moment, rather than a slow rain of organic material.
Think of it as a question about sizes before it is a question about origin.