How Scientists Discovered Dark Matter?

Scientists found dark matter by noticing things in space didn’t behave as they should, kind of like when your toy car keeps going straight even though you pushed it sideways!

Imagine you're at a party, and you can see everyone dancing, but there's also someone hiding behind the couch who isn't dancing. You know that person is there because sometimes they bump into others or make the music shake, even though you can’t see them.

Scientists did something similar. They looked at how stars move in galaxies and saw that they’re being pulled by something extra, like a hidden friend at the party. This extra pull means there must be more stuff out there than what we can see, and scientists call it dark matter.

They used big telescopes to watch how stars move. If only visible things were pulling on them, they should go slower, but they’re moving faster! That meant something invisible was helping give them a push. Scientists figured out that this invisible stuff must be dark matter, and it's hiding all around us, even though we can’t see it.

It’s like having an invisible friend who’s always there to help you win the race, you just don't know they're there!