If astronomers discovered another region with very old stars, extremely low metallicity, and stars moving in chaotic orbits, which hypothesis would be best supported?
Answer
A
The region is part of a newly formed spiral arm filled with young very young stars.
B
The region was formed during a recent starburst in the bulge.
C
The region was formed by gas pulled from a nearby galaxy last year.
D
The region may be a remnant of an ancient interaction or collapse event.