Why astronomers have difficulty looking at distant star ecept?

What reflects off the ionosphere? How many sons did selene the moon goddess have? What color is the second hottest star? How many light years away is Jupiter from Earth? What causes the changes in sunrise and sunset times over the course of the year? Why is Gravity good for us? How do you find the weight of an object on earth? Why did Robert falcon Scott became a explorer? What must happen in order to experience a total eclipse? How tall is the space needle in meters? What part of the earth faces away from the sun? Why is orientation needed in the focusing type solar collectors? What is a microscope called that uses a combination of lenses to magnify objects? What is the mission to the moon? What is a red shift and what does it mean for a star? What use is a life raft on the moon? What was the second mission to the moon? Is the sun a solid mass with fire on the outside? When the sun the moon and earth are in a straight line would an eclipse of the sun occur? What can the sun do to us very very bad?