The moon has no atmosphere at all. What advantages would you have if you built an observatory on the lunar surface?

Geostationary satellites cannot be seen in a telescope from Albany because they are always directly over the Equator. True False

The sun is 150,000,000 kmkm from earth; its diameter is 1,400,000 kmkm. For a science project on solar power, a student uses a 24-cmcm-diameter converging mirror with a focal length of 51 cmcm to focus sunlight onto an object. This casts an image of the sun on the object. For the most intense heat, the image of the sun should be in focus. Where should the object be placed? Express your answer with the appropriate units.

The sidereal drive of a telescope mounting must turn the telescope   a. southward about the polar axis.   b. eastward about the polar axis.   c. westward about the polar axis.   d. northward about the polar axis.   e. in no direction; none of the above are true.