You're right! Cassiopeia is often described as a "W" or "M" shape, but it can definitely look like a squiggly line depending on the time of year and your location. Here's why:

* Perspective: Constellations are just groups of stars that appear close together from our perspective on Earth. The actual distances between these stars can be vast. As Earth orbits the Sun, our vantage point changes, and this can make the apparent shape of constellations shift.

* Time of Year: The apparent position of Cassiopeia in the sky changes throughout the year due to the Earth's rotation and orbit. During certain times, especially when it's near the horizon, it can appear stretched out and less like a clear "W".

* Location: Where you are on Earth also influences how Cassiopeia appears. From different hemispheres, it will be in a different position in the sky.

So, it's not that Cassiopeia is actually changing shape, but rather how we perceive it from our ever-changing position on Earth.

Think of it like this: If you held a piece of paper with a "W" on it and walked around it, the "W" would appear distorted from different angles. The same principle applies to constellations.