This funny video might help you to understand the metric system a little better!

The Sun is a star found at the center of the Solar System.
 It makes up around 99.86% of the Solar System’s mass.
 At around 1,392,000 kilometres (865,000 miles) wide, the Sun’s diameter is about 110 times wider than Earth’s .Light from the Sun reaches Earth in around 8 minutes.The Sun’s surface temperature is around 5500 degrees Celsius (9941 degrees Fahrenheit),and that the average distance from the Sun to the Earth is around 150 million kilometres. The Sun’s core is around 13600000 degrees Celsius! The Sun generates huge amounts of energy by combining hydrogen nuclei into helium. This process is called nuclear fusion. Because of the Sun’s huge influence on Earth, many early cultures saw the Sun as a deity or god. For example, Ancient Egyptians had a sun god called Ra while in Aztec mythology there is a sun god named Tonatiuh.
http://www.sciencekids.co.nz/sciencefacts/space/sun.html
If you want to find out more information, check out these very useful websites!
http://www.nasa.gov/vision/universe/solarsystem/sun_for_kids_main.html
http://www.squidoo.com/sun-facts-for-kids
http://science.nationalgeographic.com/science/space/solar-system/sun-article.html
http://facts.randomhistory.com/2009/07/06_sun.html
http://stargazers.gsfc.nasa.gov/resources/amazing_structure.htm
 
Check out these games!
http://www.bbc.co.uk/schools/scienceclips/ages/9_10/earth_sun_moon.shtml
http://www.bbc.co.uk/schools/ks2bitesize/science/physical_processes/
Below is a video about the sun.

An t-Earrach
1. Tús an Earraigh             2.  Laethanta níos faide!

Bláthanna ag fás                  Aimsir níos fearr

Ainmhithe óga                      Feirmeoir ag obair

Duilleoga glas                  Ag cur síl sa pháirc