What is that thing that can happen in a million years and would be mind-boggling?

Predicting specific events that could occur in a million years is highly challenging due to the complexity and uncertainty of future developments. However, some mind-boggling possibilities based on current scientific understanding include:

1. Evolutionary Changes: Species on Earth could undergo significant evolutionary transformations, leading to the emergence of entirely new life forms adapted to different environments.

2. Climate Shifts: Earth's climate could experience drastic changes, potentially leading to the emergence of new ecosystems or the extinction of current ones.

3. Technological Advancements: If human civilization survives and continues to progress, unimaginable technological advancements could occur. This might include the colonization of other planets, advancements in artificial intelligence, or the development of technologies beyond our current comprehension.

4. Astronomical Events: Celestial events such as the collision of galaxies, the birth and death of stars, or the formation of new planetary systems could take place, reshaping the cosmic landscape.

5. Continental Drift: Over a million years, continents will continue to drift due to plate tectonics, potentially leading to the formation of new supercontinents or significant changes in Earth's geography.

6. Mass Extinctions: While it's difficult to predict specific events, the possibility of major extinction events due to cosmic events, environmental changes, or other factors remains a consideration.

7. Quantum Discoveries: Our understanding of the fundamental nature of reality, including breakthroughs in quantum physics, could lead to paradigm-shifting changes in technology and our perception of the universe.

8. Biological Engineering: Advances in genetic engineering may allow for the creation of entirely new species or the enhancement of existing ones, blurring the lines between natural and artificial life.

It's essential to note that these are speculative ideas based on our current scientific understanding, and predicting events over such vast timescales involves a high degree of uncertainty.