What is the scientific name for somebody who mends clocks and watches?

What rocket carried Yuri gagarin in to space? What is the first planet known to have rings? What are the names of nine planets in kannada? Can a fly fly on a rocket? What does it mean when you see a vision of no roof? What celestial body orbits the Earth in the same way that the Earth orbits the Sun? What is Neptune's star sign? How many earths is it in the universe? What effect can zero gravity have on the human mind? Why they are called satellites? Which planet is called the north star? When did hubble discover the Milky Way? What is a hot-air balloon basket called? What is the difference between GMT and BST? Who is the princess called Andromeda? How does the distance affect the time it takes the earth and the other planets to go around the sun? What causes a star to become a giant? What instrument used to view the moon from Earth? Energy from the sun is distributed around the earth by? What color is in this year?