Fill in the blank with one suitable word from the box

Fill in the blank with one suitable word from the box.
        
Neptune                           Galaxy                      Unidentified flying object                              meteor
planet                            spacecraft                               alien                              pilot    
Mineral                           gemstone                                 orbit                     outer
        
1.    Is “The Milky Way” another name of the ......................... ?
2.    In the solar system, counting from the Sun, ......................... ranks eighth.
3.    Our Earth is just a small part of the ......................... space.
4.    UFO is an abbreviation for “ . Unidentified flying object........................ 
5.    Earth is the ......................... on which we live.
6.    A ......................... is a vehicle that travels in space.
7.    An ......................... is a creature from a planet other than Earth.
8.    A ......................... is a person who flies an aircraft.
9.    A large piece of rock from space that appears as a bright light in the sky is called ......................... 
10.    ......................... are natural substances such as coal, oil, salt, gold, or diamonds.
11.    A ......................... is a beautiful expensive stone that is used to make jewelry.
12.    An ......................... is a curved path taken by a planet or an object as it moves around another planet, star, moon, etc.