Why are we unlikely to find Earth-like planets around halo stars in the Galaxy?
A) Planets around stars are extremely rare in our Galaxy.
B) Halo stars formed from gas containing few heavy elements, the elements needed to create terrestrial planets like the Earth.
C) Halo stars formed from gas containing lots of heavy elements and few of the light elements needed to create terrestrial planets like the Earth.
D) Halo stars are all very low mass stars that cannot hold onto planets.
E) Halo stars formed directly from gas in the halo without forming a planetary disk.

Question

Quizplus · Accepted Answer

Halo stars are old stars that formed early in the history of the galaxy, when there were fewer heavy elements available to create planets. The lack of heavy elements in the gas from which halo stars formed makes it difficult for terrestrial planets like the Earth to form around these stars. Therefore, it is unlikely that we will find Earth-like planets around halo stars in the Galaxy.

Why Are We Unlikely to Find Earth-Like Planets Around Halo