Here's why:
* Distance: Stars in constellations can be vastly different distances from Earth and from each other.
* Perspective: We see constellations as patterns because of our perspective from Earth. They are projected onto the celestial sphere and appear close together, even though they are millions or even billions of light-years apart.
* Proper Motion: Stars are constantly moving through space, so the patterns of constellations are slowly changing over time.
Think of it like this: If you hold up two fingers in front of your face, they appear close together, even though they are actually inches apart. Constellations are similar, just on a much larger scale.
