Space:

http://www.austromir.at/ 
https://www.ffg.at/en/content/austromir-91-0  
https://spaceteam.at/
https://gate.space/
https://www.space-explorers.org/  
http://www.igar.at/     
https://aose26.wildapricot.org 
http://www.iafastro.org/
https://oewf.org/portfolio/ase-2016/
https://de.wikipedia.org/wiki/Sojus_TM-13
https://www.nasa.gov/launchschedule/  
https://hubblesite.org/
https://www.heavens-above.com/main.aspx
https://apod.nasa.gov/apod/
https://www.universetoday.com/
http://stars.chromeexperiments.com/
https://photojournal.jpl.nasa.gov/
https://www.solarsystemscope.com/
https://www.nasa.gov/multimedia/imagegallery/iotd.html
https://www.telescopeguide.org

​​​

STEM:

https://www.ffg.at/Europa    
https://www.firstinspires.org/ 
https://www.planetsforkids.org/
https://trainlikeanastronaut.org/
https://tryengineering.org/about/  
https://www.esa.int/Education
https://dealhack.com/blog/stem-scholarships-for-students