Show students pictures of every planet of our solar system and of the sun. Divide children into pairs and ask each pair to create a flat model of a specific planet. Give a plastic cup to every pair to trace around, as kindergartners cannot use a compass, and instruct children to color the planet based on what they see on your pictures. Disregard the right proportions of planets on this task. When all pairs are done, glue all planets on a white sheet of cardboard, with the sun in the middle and the planets around it, in the right order.
You can introduce children to several letters of the alphabet through words relevant to space, such as "A for astronaut," "E for Earth," "M for moon," "S for space" and "U for Uranus." Make worksheets for each of these topics, including a picture of the discussed topic, its word written in big bold letters and the letter you are examining in dotted lines. Children can trace the letter and then search for it within the word.
Planets don't have the same size, allowing you to introduce inequalities to children. Prepare proportionate flat models of each planet and the sun and bring them to class. Show two models at a time, such as those of Mercury and Jupiter, and ask children to tell you if one is smaller or larger than the other. You can also scatter all models in front of children and ask them to determine the largest or smallest of them all.
People have explored the universe with their naked eyes or with telescopes for thousands of years, but since the mid-20th century, space exploration has become a reality. Show children pictures of space pioneers, such as Yuri Gagarin, the first man in outer space, or Neil Armstrong, the first man on the moon. Afterwards, work together with children to create a space rocket craft, made out of a paper towel tube, tin foil and construction paper.