Bet

Its story

Beta Doradus is one of the classical Cepheids, those yellow supergiants that pulse with the regularity of a cosmic metronome. Every 9.84 days it shifts from magnitude 4.1 to 3.5 and back, a breathing rhythm that turns it into a beacon for measuring the universe. It spans about 65 Suns and lies roughly a thousand light-years away, marking the bearing of the Goldfish across the southern sky.