Here you can fin all the sites that were used for creating the content and some activities of the blog in the following links:
http://www.eslvideo.com/
https://storybird.com/
http://www.slideshare.net/
https://www.youtube.com/
https://soundcloud.com
https://www.google.com/forms/about/
https://www.goconqr.com
Solar system
http://solarsystem.nasa.gov/kids/
http://www.edu.pe.ca/southernkings/Solarsys.htm
https://www.esa.int/esaKIDSen/SEMF8WVLWFE_OurUniverse_0.html
http://www.dkfindout.com/uk/space/solar-system/
