A late evolutionary stage of a medium-mass star where the outer layers expand and cool after hydrogen fusion in the core ceases. Red giants can eventually shed their outer envelopes, forming planetary nebulae.
Source: esa.int
27/04/2025
25/02/2025
22/11/2024
25/10/2024
02/08/2024
11/07/2024
06/07/2024
28/03/2024
12/02/2024
08/02/2024
26/01/2024
16/01/2024