How fast do spacecrft travel?

Why do you think the us space program should continue? Are diamonds found in Kansas? Heat from the sun? What is the study of celestial bodies called? What does the lows pressure system do? What magic fire from Zeus? Why does a layer of fog often form over the ground in the early morning? A serve storm that forms as a rapidly rotating funnel cloud is called? How many pound would you weigh on Jupiter if you weigh 85 pound on Earth? What part of the microscope supports the objective lens system and the eyepiece? Why is the sun is the most important object in the universe? What causes tides to change throughout the day? What type of cloud is white and fluffy? Ptolemys proof of his beliefs would be acceptable today why or why not? What helps the earth to go around the sun? Which astronaut did not fly on the Apollo 13 mission? Why is the sun most important in the universe? Who and when discovered the north star? Who was responsible for the further development of the microscope during the 19th century? How did they make candles in the 1700's?