How do kepler's laws describe planetary orbits especially earth's

According to your text, systems of government in the united states are shifting from what to what?

2. explain the two different types of egyptian calendars. 3. what architectural advances did the ancient egyptians make? what impact do these advances have on our lives today? 4. what did egyptian art usually depict? how does this compare to forms of art that we see today? 5. what all was found in king tut’s tomb?

Radiation was first detected by a ?