If dinosaurs landed on the moon...?

Depending on the author want brought the fiction to where

Let's boil part of your question down a bit: "How long do footprints last on the Moon?" The simplest answer is that we don't know, but it's a very long time, because there is no erosion or volcanism on our moon. However, because we don't know with any kind of certainty just how long it takes for meteoric bombardment to completely turn over the surface, it's really hard to say. The link below takes a stab at it, but only within an order of magnitude, perhaps between 10 and 100 million years. So, if your dinosaurs landed a billion years ago, chances are the prints would be gone. Ten million years, and there's a good chance. Of course, any equipment left behind, such as the scientific instruments and the lower lander section, would persist much longer, as long as they aren't buried entirely or destroyed utterly by a direct impact.

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<would we be able to still see evidence of their landing and would we have found it by now?> The chances are very slim that we would have seen it by now. Even knowing the exact location of the Apollo landings, it's only been withing the last decade that we've been able to image them directly from lunar orbiters, which means the chances of finding unknown sites are virtually zero. We haven't even found most of the known unmanned landing sites yets. This will probably change in the future, as the lunar surface is imaged in greater and greater detail, but as long as most images only have the resolution to see tens of meters per pixel, we simply don't have the kind of detail necessary to pick out fine details such as pieces of equipment. After they do, then it will take time before they are recognized as such. It's not unusual in astronomy for a detail to be imaged but not discovered until later, hence the term "pre-discovery image".

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So, "would they exist" and "would they be detected" are two different questions, with "probably" and "almost certainly not" being the answers.

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When the dinosaurs landed on earth, they made sure to remove all evidence of the ancient space ships. There was no asteroid or meteroid, it was the slave mammals rebelling against the Stegosaurus overlords. The casualties of the Great War where so great that the mammals decided to nuke all other dinosaurs. That is why they don't exist today, but you can still contact them thought mental consentration and a little but of cocain.

Two seconds after landing on Moon it 'd die gasping for want of Oxygen.

All I want to say is no fat otool fat ***** on my planet!