Stars twinkle. Planets shine steadily. Why? Stars twinkle (scintillate) because they’re so far away from Earth that, even through large telescopes, they appear only as pinpoints. And it’s easy for Earth’s atmosphere to disturb the pinpoint light of a star. Thus the stars twinkle. They can even appear to move around a bit in the sky. As a star’s light pierces our atmosphere, each single … Continue reading Why do stars twinkle ?