Why do the stars in the sky become dimmer in summer?

And another reason for the spectacular winter sky is that in summer our planet faces the bright centre of the galaxy. But during the winter months, the Northern Hemisphere looks towards the edge of the Milky Way. Scientists believe our galaxy is made up of about 300bn luminaries. In summer, we see most of them. Just as light pollution makes it hard to see stars in a city, the brightness of the inner galaxy makes it difficult to distinguish individual stars in the sky in summer.