CAMBRIDGE, England, Jan. 20 (UPI) -- European astronomers say new evidence suggests the Milky Way may have formed from the inside out, expanding out from the center.
New observations using a European Southern Observatory telescope in Chile suggests older stars inside the Solar Circle -- the orbit of our sun around the center of the Milky Way, which takes roughly 250 million years to complete -- are far more likely to have high levels of magnesium, suggesting this area contained more stars that "lived fast and died young" in the past.