Article if you’d rather read about it.
A common joke is “just launch X into the sun and be done with it”. Turns out, that’s actually a really difficult thing to do.
From Earth, we would have to accelerate a spacecraft to 33 m/s in the opposite direction of our orbit in order to get it to fall into the sun (without entering an elliptical orbit) For reference, we only need to launch a spacecraft at 11 km/s in the same direction of our orbit to cause the spacecraft to escape our solar system.
This means that it would take less energy to launch a spacecraft to another star than our own sun.
It just makes sense if you think about it. It also takes some 50%+ more velocity to go to the sun from Mercury than from Earth, due to Mercury orbiting sun at the speed of 47km/s