NASA Explore the Solar System – a wealth of information on Sun, Moon, Planets and more!
https://solarsystem.nasa.gov/solar-system/our-solar-system/overview/
Various astronomy topics:
https://www.rmg.co.uk/discover/explore/astronomy
All about the Moon:
https://www.astrosociety.org/education/astronomy-resource-guides/the-moon-a-resource-guide/
Resources for teachers from the UK Institute of Physics:
http://www.iop.org/education/teacher/resources/teaching_astronomy/page_45071.html
Resources for teachers from ESA (European Space Agency) :
https://www.esa.int/Education/Teachers_Corner/Teach_with_space3
Stellarium – free software to download on your PC/laptop to learn about the night sky:
https://stellarium.org/
Skymaps – print out the map each month to learn about the night sky:
http://www.skymaps.com/downloads.html
How to see the ISS:
Did you know that sometimes you can see the ISS (International Space Station) as it orbits the Earth?
Use one of the websites to tell you when you can see it from your location:
https://spotthestation.nasa.gov/
https://www.heavens-above.com/
Links to learn about Radio Astronomy:
https://www.skatelescope.org/radio-astronomy/
https://public.nrao.edu/radio-astronomy/what-is-radio-astronomy/
https://www.atnf.csiro.au/outreach/education/everyone/radio-astronomy/index.html