S P A E GALAXIES AND STARS IAN GRAHAM Smart Apple Media
THE NIGHT SKY At night the sky is full of twinkling points of light Most of them are stars like the Sun They look smaller than the Sun because they are further away RISING AND SETTING Every night the stars rise in the east cross the sky and set in the west They seem to move like this because the Earth is spinning On a clear night you can see about 2 000
GALAXIES Stars are not spread out evenly in the Universe They travel through space in giant groups called galaxies Each galaxy has billions of stars and there are billions of galaxies LIGHT YEARS The distances between o stars are so big that they are measured in light years A light year is the distance light travels in one year six trillion miles ten trillion km Stars travel through space together in galaxies like this N SP
