It is theoretically possible for some material from the asteroid impact that occurred 66 million years ago to have reached the Moon or Mars, but the likelihood is very low. The impact event, which is believed to have caused the extinction of the dinosaurs, created a massive explosion and ejected debris into space. Some of this debris may have been launched with enough velocity to escape Earth's gravity and enter space.
However, for the material to reach the Moon or Mars, it would need to overcome several significant challenges. First, it would have to navigate through the Earth's atmosphere, which can cause the material to burn up or disintegrate due to the intense heat generated during atmospheric entry.
Assuming some fragments managed to survive atmospheric entry, they would then need to travel the vast distance to the Moon or Mars. The Moon is approximately 384,400 kilometers away from Earth on average, while Mars can be as far as 401 million kilometers during its farthest point from Earth. The chances of fragments traveling such vast distances and accurately targeting these celestial bodies are extremely remote.
Moreover, the Moon and Mars have their own gravitational fields, which could affect the trajectory of incoming debris. The Moon has a weaker gravitational pull compared to Earth, making it less likely for material to be captured. Mars has a stronger gravitational pull but is significantly farther away, making it even more challenging for debris to reach.
While it's not impossible for tiny fragments from the asteroid impact to have made their way to the Moon or Mars, the chances are exceedingly slim. Most of the debris from that impact would have remained within Earth's gravitational field or settled back onto the planet's surface over time.