Astronomers decode Milky Way's violent birth(1/3)

The merger of the Milky Way progenitor galaxy and the dwarf galaxy Gaia-Enceladus roughly 10 billion years ago (L) and the current appearance of the Milky Way galaxy (R) are shown in this artist's conception released by Instituto de Astrofisica de Canarias in La Laguna, Spain on July 22, 2019. (Photo/Agencies)

The current appearance of the Milky Way galaxy (R) is shown in this artist's conception released by Instituto de Astrofisica de Canarias in La Laguna, Spain on July 22, 2019. (Photo/Agencies)

The merger of the Milky Way progenitor galaxy and the dwarf galaxy Gaia-Enceladus roughly 10 billion years ago is shown in this artist's conception released by Instituto de Astrofisica de Canarias in La Laguna, Spain on July 22, 2019. (Photo/Agencies)