Not sure if people have commented on your submission so far, as it's still under judgement, but generally I would suggest the following:
- the Quit button seems somewhat obsolete
- use a sans serif font, as that is more easily intelligible, also use white framed in black colouring for your writing, as that can be read on backgrounds of any colour
- keep the Next/Back buttons in a fixed place for all pages
- the main index seems a bit crowded, space them out over the whole page, perhaps divide them by topics into clusters (as they are already listed following a certain logic)
- use more paragraphs insertions (?) in your text bodies, it will also increase legibility
- the examples images of the different star sizes/blackholes/... were pretty cool, an image (or diagram, or model, or CGI etc.) for every entry would make the entire thing as "dude!"-evoking as the page with the stars.
- is the wikipedia logo supposed to tell the readers that it's your "works cited"?

I still think, this is pretty neat, and certainly informative for people who'd like to start learning about astronomy/astrophysics or want to refresh their basic knowledge about it.

Legau liked , of a note in my also

takes long to load and some text parts are out of view.
interesting and seems legit.

Good idea, needs work.
AS its still a bit on the not finished side of things, it lacks music and it has just text after clicking.

Might wanna try and make this a little cooler and it will pass judgement as right now its okay but not great.

Loved it!