What in space might change alien signals before reaching Earth?

Imagine you're sending a message through a really long tunnel, space is like that tunnel! But sometimes things inside the tunnel can mess up your message before it reaches the other end.

Space isn't empty, and what’s in it can change how signals from aliens look when they get to Earth. It's like shouting down a hallway, but someone is playing with a fan in the middle, the wind makes your voice sound funny by the time it gets to the other side.

• Dust and gas floating around can make the message weaker or blur it out, just like fog makes things hard to see.
• Stars and planets can bend or twist the message like a funhouse mirror, it still looks familiar, but not exactly how it started.
• Sometimes, other signals from space might mix in with the alien one, like when two kids shout at the same time, you hear both voices, but not clearly.

So, just like your voice can change while traveling through the hallway, an alien signal might change too before reaching Earth! Imagine you're sending a message through a really long tunnel, space is like that tunnel! But sometimes things inside the tunnel can mess up your message before it reaches the other end.

Space isn't empty, and what’s in it can change how signals from aliens look when they get to Earth. It's like shouting down a hallway, but someone is playing with a fan in the middle, the wind makes your voice sound funny by the time it gets to the other side.