The globular star cluster 47 Tucanae is a jewel in the southern sky. It is the second brightest globular cluster in the sky after Omega Centauri. It can be seen with the naked eye near the Small Magellanic Cloud in the constellation Toucan. Together with around 200 other globular clusters, it travels through the halo of our Milky Way. 47 Tucanae consists of hundreds of thousands of stars in a cosmically confined space with a diameter of only around 120 light years. Red giant stars are easily recognisable as orange stars at the edge of the cluster. In 47 Tucanae, astronomers have discovered a celestial body that orbits its partner at an unimaginable speed of around 2 million kilometres per hour. A star that orbits a black hole in half an hour at about 2.5 times the Earth-Moon distance.