Astronomy
The Open University has a nice educational unit on the Big Bang
http://www.open.edu/openlearn/science-maths-technology/science/physics-…
Cosmic Evolution: From Big Bang to humankind
https://lweb.cfa.harvard.edu/~ejchaisson/cosmic_evolution/docs/splash.html
Bad Astronomy is devoted to airing out myths and misconceptions in astronomy and related topics
https://slate.com/technology/bad-astronomy
Solar System Exploration is a nice site by NASA on the exploration of the solar system
https://solarsystem.nasa.gov/
Sky Maps Each Month For you to explore, learn and enjoy the night sky
http://www.skymaps.com/