What is MACHO?

A MACHO is like a super strong, invisible person who lives far away and can hide from our eyes by being really good at blending in.

Imagine you're playing hide-and-seek with someone who's super good at hiding. That person might be so good that even though they’re right there, you can't see them because they're just like the background, maybe a wall or a tree. MACHO stands for "Massive Astrophysical Compact Halo Object," which means it’s a big, heavy object in space that's hard to spot because it doesn’t shine like stars do.

Think of a MACHO as a giant ball made of stuff we can touch, like rocks or gas, that floats through space. When it passes by a star, its gravity can bend the light from that star, making it look brighter for a little while, just like when you squint and see things get bigger.

Scientists use this trick to find MACHOs because they help us learn more about what's hiding in our galaxy, kind of like finding invisible friends who play hide-and-seek with stars!