If you are unable to view MPEG videos with the plug-in above, click here to download the Video view of Earth from space in MPEG format suitable for viewing in an external viewer. The Sun, however, is so hot that nothing can get close to it without burning up. By the light that the Sun and stars send to us. To get information about objects out in space far away from Earth, astronomers need something from those objects which carries information to the Earth. To answer these questions, think about how you know that the Sun, stars, and other objects in space exist.
Light carries a lot of information.
With the proper tools, astronomers can dig information like buried treasure out of the light they receive. Several of these tools will be described below, and the reader can use some of them to dig information out of real observations of the Sun obtained with one of NASA's rocket experiments. Light can be described as waves which travel through space, like the ripples which travel across a pond after a stone has been dropped into the water. For both light and pond ripples, the wavelength of the waves is the distance between wave peaks. The light that your eyes can see is known as visible light .