The Cosmic Measurement Chart

This Cosmic Measurement Chart shows the data used for the diameters of each planet given in both values; Kilometers (km) and the unit we used to measure the diameters of our neighbouring planets, the Earth Unit (EU).

The Earth Unit (EU) was derived by taking the kilometer (km) value of each planets diameter and dividing it by the diameter of Earth also in kilometers (12, 756 km).

Test Your Knowledge

• You're going to need a calculator for this part, along with your pencil and paper.

Below you'll se where I calculated the first Earth Unit (EU) ratio using the planet Mercury. The value that the calculator gives for each division should be rounded to 2 decimal places. This is a neccessary practice to illimainate writing down vast quantities of numbers.

Recap:
Remember that to round the values to 2 decimals places you analyze the third number behind the decimal point. If its below 5 (including 0) the third value is unchanged. However, if it's 5 and above (stopping at 9) the third value increases by 1.

Example:

• 0.472646; The 3rd number is 2, this is lower than 5. Therefore, the 2nd value '7' is unchanged and the rounded number becomes '0.47'.

• 0.279392: The 3rd number behind the decimal in this case is 9 which is greater than 5. Thus, the 2nd value '7' is increased by 1 and the rounded number becomes '0.28'.

Now grab your paper, pencil, and calculator and let's see how you do. Below is the planet diameter ratios.

Like mentioned above, the first one is done for you. Use your calculator to find the rest of the ratios and record them on your paper.
For easy reference to where the value would go on the data sheet, it is highlighted in purple. The Earth's diameter is highlighted in blue.

Once your answers are recorded, click the data sheet and revealt he correct answers. GOOD LUCK! 

Image of our beautiful planet Earth