How many space shuttle missions were launched?

Should you change the bed skirt when you change the sheets? During which stage do stars produce energy from the fusion of hydrogen into helium? How do people protect themselves from the sun? Do rockets land on the moon? How does space give us oxygen? When earths early atmosphere formed which gases where lost because earths gravity was too weak? Who invented Fluoroscopy? What occurs at full moon when earth passes between moon and sun? The shape of a constellation appears not to change because? How did uncle Henrik's boat get its name? Is red giant a star or a type of star? Are the safe solar eclipse glasses available for purchase online? How far can a light microscope zoom in? How did the cyclops forge Zeus' lightning bolts? What position is the sun when you see half moon? What word is used to describe knowledge about the universe in the method of obtaining that knowledge? -aurora -Diana -cupid -venus -jove -dido -Juno -titan What are these roman gods and goddesses in charge of and what are their characteristics? Why is it hard to see fog? How was Orion formed? Do stars have the same brightness and sizes?