Why do stars seem brighter in winter?
Photo: tychay
The stars seem so much brighter in the winter than in the summer.
We’re actually looking toward many, many more stars in summer than in winter.
In summer, our evening sky is facing toward the center of the Milky Way galaxy – about 30 thousand light-years away. We don’t see into the exact center because it’s obscured by galactic dust – we’re looking edgewise into the galaxy’s disc. The “hazy” quality of the summer sky is really the combined light of billions of stars.
In winter, we’re looking the opposite way – into the spiral arm of the galaxy in which our sun resides. The winter stars tend to be closer to us – and there really are some gigantic stars located in this direction. We’re looking edgewise into the disk of the galaxy in winter, too. But we’re looking toward the outskirts of the galaxy – so we’re seeing far fewer stars. That’s why the winter sky has a clearer, sharper quality than the summer sky.
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