Breakdown:

1. The Scale of the Galaxy: The Milky Way galaxy is about 100,000 light years across. This vast distance makes the idea of any advanced civilization reaching us from outer space extremely difficult using conventional means of travel.
2. Planck Energy – The Ultimate Energy: For any civilization to reach us or explore the galaxy efficiently, they would need to harness an immense amount of energy, known as the Planck energy. This is the highest possible energy level, associated with phenomena like the Big Bang and black holes. It is the energy required to manipulate the very fabric of space and time.
3. Limitations of Einstein’s Laws: Einstein’s laws of space and time, which govern our current understanding of the universe, begin to break down when you reach the Planck energy. At this point, space and time become unstable, leading to the possibility of creating wormholes.
4. Wormholes as Shortcuts: A wormhole is a theoretical shortcut through space, allowing for interstellar travel. Similar to Alice in Wonderland, where Alice moves between two different universes, a wormhole could potentially connect two distant points in space, making long-distance travel across the galaxy possible in a short amount of time.
5. Advanced Civilization Possibilities: An advanced civilization capable of harnessing Planck energy could create wormholes, enabling them to travel vast distances in the galaxy, perhaps even reaching Earth. This level of energy manipulation could revolutionize space travel by bypassing the need to traverse the immense distances between stars.

The idea of interstellar travel hinges on mastering extraordinary levels of energy and the manipulation of space-time through wormholes, a concept rooted in theoretical physics and still far beyond our current technological capabilities.