<https://phongthuythuchanh.com/2021/09/16/how-to-draw-the-andromeda-galaxy-using-an-algorithm/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://phongthuythuchanh.com/2021/09/16/how-to-draw-the-andromeda-galaxy-using-an-algorithm/>