in astronomy, why does flux decrease with distance but not intensity?

Question

in astronomy, why does flux decrease with distance but not intensity?

In: 2

Answer 1

Imagine you’re spraying glitter from a bottle onto your bedroom floor. If you spray close to the floor, the glitter is all bunched up in one spot. But if you stand on your bed and spray, the glitter spreads out more. That’s like flux; the farther away, the more spread out and less glitter in one spot. But each piece of glitter is still as shiny no matter where it lands. That’s like intensity; each little light bit is just as bright no matter how far away it is.