What does star mean on 50 dollar bill?

What special equipment does an astronaut wear? Why is the sky an orange and brown? When an astronaut lands on the moon what is his mass? Wegeners idea that tidal forces might cause continental drift was shown to be impossible when it was? What was Hermes the Greek God's eye color? What are the temperatures of the four main layers of the atmosphere? What did Eileen Collins accomplish in 1995? Where is nasa control tower? The polar ice caps of Mars is believed to consist mostly of? Planet whose axis of rotation lies almost in its orbital plane? Which planet is the dwarf planet? How is the sky reflected at the Salar de Uyuni? What is the difference between a planet and a planetoid? What do you call objects that orbit around planets? Is Saint Julie Billiart the patron saint of sunshine? The third stage in the life cycle of a star? In what celestial event do stars appear to be flying in a straight line across the night sky? Where can big dipper be found on a star map? Is Jupiter hard? What are the limitations of the sundial?