The blog from the summary cites no sources. Hell, they don't even hint at where they get their information. The other link to a story is a rehash of the blog post. The others are unrelated to the main story.
And in case you're wondering, the blog post doesn't say why they quit or what does "quitting" mean. One can assume from the text (though it doesn't actually say it) that the main space agency was disbanded by the government, but that's all. Why? Who knows!
This is some high-quality journalism here.