Why do stars twinkle?
Show answer & explanation
Answer: Atmosphere turbulence bends light
Distance makes light flicker — Wrong. Distance doesn't cause twinkling. Atmospheric turbulence does—moving air pockets of different temperatures/densities bend light differently, creating twinkle.
Space dust blocks starlight — Wrong. Dust can dim starlight, but twinkling comes from atmospheric turbulence—moving air with varying density randomly bending light paths.
Atmosphere turbulence bends light ✓ — Correct! Twinkling (scintillation) occurs when starlight passes through Earth's turbulent atmosphere. Moving pockets of air with different temperatures and densities bend light slightly differently, causing rapid brightness/position changes. Planets don't twinkle much because they're closer—larger apparent size averages out the atmospheric effects. Astronomers build telescopes on mountains to reduce atmospheric turbulence!
More Light & Vision questions
- Indigo jeans look blue. Which light is the dye mostly taking away?
- Why are blue-green or white night lights often worse for insects than redder light?
- Moths circling a lamp are not simply aiming at it. What flight reflex gets hijacked?
- Why does glass break light into colors?
- Why do we see darkness when eyes are closed?
- Why do sunsets appear red and orange?