Watch the sun set from a particularly dark patch of Earth and you may spot a triangle of what scientists call zodiacal light extending from where our star passed below the horizon.
Ghostly glow in alien skies: 'Zodiacal light' possibly spotted on 3 exoplanets : Read more
Ghostly glow in alien skies: 'Zodiacal light' possibly spotted on 3 exoplanets : Read more