What is crescent mean?

Why are the objects at a distance seen more clearly after rains which process? What is the 2 ways of the separating the nails from the sawdust? How many mins in 750mb? How do the tides change based on the moon? What type of material is used for the GORE of the hot air balloon? What is continuous sounding of a ship fog horn? Why can bats not see at night but in the day light? How can scientists calculate the age of the universe using red shift? What is the setting of the Hitchhikers Guide to the Galaxy? What is a thin shape of the moon called? Saturns location among other planets? When can cygnus be best viewed best? What is the significance of the dark side of the moon in relation to lunar exploration and scientific research? Where was the space race? How can a binary star system be detected? What is an endiscopy? Who was the first female pilot to fly the space shuttle? Where is the NASA space center? What is the phone number of the Moon Township Public Library in Moon Township? What is the difference between Zeus and Jupiter?