What are modified gravity models?

Gravity is the force that keeps us on the ground and makes planets orbit stars, like a gentle pull between things. But sometimes scientists think gravity might not be exactly what we’ve always known it to be.

Imagine you have a big, stretchy rubber band. When you put something heavy on one end, it pulls the other end toward it, that’s like how gravity works. But in modified gravity models, it's as if the rubber band is behaving differently when things get really far apart or really heavy.

Sometimes scientists think gravity might act more like a rubber band that stretches faster than usual, especially between very big objects, like galaxies. This can explain why stars in galaxies move the way they do without needing extra invisible stuff we call dark matter.

It’s like if your rubber band suddenly stretched farther on its own, you wouldn’t need an invisible helper to make it work!