Controls: Use your arrow keys to move the tiles. When two tiles with the same rank touch, they merge into one! The ranks used in this game are: 分子云，主序前，零龄主序，主序，红巨星，氦闪耀，水平分支，渐进巨星分支，行星状星云，白矮星，Ia型超新星. 游戏序列来自 Topp: Topp@Guokr
Astro Facts:
Stellar evolution is the process by which a star undergoes a sequence of radical changes during its lifetime. Depending on the mass of the star, this lifetime ranges from only a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe. The table shows the lifetimes of stars as a function of their masses.
Note: This is a fork from https://github.com/aenon/aenon.github.io created by Aenon.