Stargazing with the SKA
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The Square Kilometre Array (SKA) is a multiradiotelescope project that when complete will be the largest and most capable radio telescope available to scientists. It will allow scientists to study and collect information about the universe.Radio telescopes detect the radio waves that are produced by physical occurrences in space, and then translate these waves into data and imagery which can be used by astronomers, often in conjunction with optical and other types of telescopes.In its first phase, the SKA will be made up of three telescopes, each made up of thousands of small antennas—which will cover a total area of one square kilometre.
Teacher notes
The teacher notes contain: an overview of each of the activities; curriculum links and suggested year levels; background information; prompting questions and key mathematical points; practical suggestions for running the activity; a list of resources needed; and further ideas. 
Activity 1: Heavenly bodies
Years 7–9 Students investigate the physical properties of different planets in the Solar System concentrating on using appropriate units. They then compare some of the properties (for example, mass) in raw figures, and then by using a unit base measure.Students may also investigate the use of the Southern Cross in navigation. 

Activity 2A: How big is a square kilometre?
Years 7–9 Students will construct a square metre and work out how many of these are needed to make a square kilometre. They will then use maps to determine the extent of a square kilometre in a familiar area.There are also several questions requiring calculations of circular areas in the context of telescopes located in Australia. 

Activity 4: Seeking spirals
Years 8–10 Students investigate Archimedean and logarithmic spirals. They then draw both types of spiral by hand, before using technology to draw and change a logarithmic spiral.Students simulate selecting random points to reduce redundancy firstly by hand, and then using spreadsheets. 

Spreadsheet A 

Years 8–10 Students are able to quickly generate 50 sets of 10 points by using the ‘refresh’ function. The distance is determined by using the formula for the distance between two points (x1, y1) and (x2, y2). 

Spreadsheet B 

Years 8–10 This spreadsheet explores the means to convert polar coordinates to Cartesian coordinates and hence investigates points on a spiral. 
