Dangerous. Novas, or supernovas. Tycho Brahe coined the phrase "nova stellarum" when a "new star" appeared in the night sky. We now know that he was observing a supernova, the death throes of a very...
Red Dwarf stars. Massive stars are also quite common, but stars like that (e.g. R136a1) don't last very long.
there are 2 stars i only know that is the white dwarf and the red giant
Sea star and the star fish are the same animal.
they can range from red for the least hot stars, through orange, yellow and eventually to white and blue for the hottest stars.