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

What is the study of heavens called? Would kicking a bucket In space hurt? How do space shuttles enter and exit space? How does water vapor condense into water droplets? Why is Draco named Draco? What does astro ad nom mean? What is a pattern in the stars called? Would your weight change if you went on a plane? If you will drive north of town to a dark spot you can easily see venus what do i capitalized? What does Odysseus mean when he says that no man can avoid the eye of Helios? Is luniya or lunia is sub caste of rajput? Why space exploration will take up a lot of resources? What is a group of stars making an imaginary pattern? The moon is 382000000 m from earth how long does it take a radio signal to reach the moon and back to a reciver on earth show your work? How much CO2 is produced by solar power? How many Earth weeks does it take Mars to get around the Sun? How long does it take an M-type star to reach the main sequence compared to a star like your sun? How much does a 120 pound person weigh on the moon? How far away is the farthest object sent out from earth? Which country was the biggest crator found in?