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Transcript
Monday Sept 14 A planetary system is a star and all of the planets, moons, and other objects and materials that orbit that star. Until very recently, there was only one known planetary system Even though many People suspected that most stars had planets orbiting them, we had no scientific evidence to support this suspicion. The one planetary science we knew of was our own Solar System, named for the star that rules, SOL. Now with the aid of new instrumentations, astronomers have found a handful of distant planets orbiting other stars, and they estimate that there are probably billions more planets yet to be discovered in our galaxy. 1.What is the closest star to Earth? 2.How many other planets are in the Solar System? 3.What other objects are found in the Solar System? 4.How big is Earth? 12,756 km in diameter 40,000 km around The assemblage of objects, distances and directions that you use to establish the location of something is called frame of reference. A frame of reference can be tiny, like inside a shoebox, or huge, like the state of Texas. People use various kinds of tools to help them describe the locations of things. What is that tool? A map is a representation of a place or area. Point of view is a term used to describe the position from which an observation is made.
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