Planetary nebulae, stars similar to the Sun which have burnt up their fuel and ejected their external layers, make it possible to study two main substructures of the Andromeda galaxy and determine their histories.
Elu, loodus, teadus ja tehnoloogia
Planetary nebulae, stars similar to the Sun which have burnt up their fuel and ejected their external layers, make it possible to study two main substructures of the Andromeda galaxy and determine their histories.