NASA's Hubble Space Telescope has captured a stunning image of the binary star system R Aquarii, featuring a pulsating red star and its surrounding nebula. The system is approximately 710 light-years away in the constellation Aquarius. What makes R Aquarii unique is that it consists of two stars: a massive, cool red giant star and a dense, compact hot white dwarf star. The interaction between these stars causes the red giant star to dim and brighten over 390 Earth days, resulting in a variable brightness.

Source: https://www.livescience.com/space/astronomy/space-photo-of-the-week-hubble-spots-a-stellar-h-bomb-exploding-in-aquarius-at-1-million-mph