Matariki refers to a cluster of stars visible in the night sky in Māori tradition. Mercury is the smallest planet in the solar system. The first person to walk on the moon was Neil Armstrong and Buzz Aldrin. Earth can support life because it is in the habitable zone where liquid water can exist on its surface. The solar system is called as such because it refers to our star, the Sun, and everything that orbits it or is near it, like planets, comets, asteroids. Stars appear at night because the sunlight during the day is too bright and washes them out.