What is heliocen?

What is the significance of the Nose End marking on a rocket or missile? How many times has Marc garneau been in space? What would happen if a planet had no inertia? Does sun revolve around any celestial body? What is the haab calendar made of? This constellation was placed in the sky to honor Orion's hunting dog.? Who was responsible for the further development of the microscope during the 19th century? How would the absence of an atmosphere on Earth impact the interaction of meteors with the planet? What is the furthest man has ever seen into space? Does the Sun move east to west across the sky? Where does the center of mass for Earth orbiting the Sun lie in relation to the Sun itself? What are two ways that the temperature inside spacecraft is kept at a safe level of the crew upon re-entry? What modes of communication can astronauts use when they are outside the space shuttle? What IS A Clock Topper? What are the things that will serve the astronauts? What is moon shadow point of view of the opium dens chapter 4? How far is the constellation cassiopeia from earth? What are the coordinates for earth according to the hitchhiker's guide to the galaxy? Why was Demeter upset? One complete revolution of a planet around the sun equals one?