Here is a list of resources that I find really helpful when explaining the answers to some of my children’s science questions:
I love this interactive periodic table on the Royal Society of Chemistry’s website. If you hover your pointer over an element, you get a pop-up with an overview of that element’s properties. But if you click on the element, you get a much more detailed factsheet about that element.
But if you want to know what’s it actually like in space, then read this blog post by astronaut Tim Peake about space travel and life on the International Space Station. And then there’s this set of resources by NASA all about rocket technology.
The BBC Bitesize website has some really great explanations of lots of different science and technology topics. Including this helpful page on the classification of living things. I also like the Royal Entomological Society’s website ‘what’s that insect‘ section.