November 14, 2013: According to new Hubble Space Telescope observations of our Milky Way's siblings, which existed long ago, the night sky must have looked much emptier in the distant past, when our galaxy was still under construction. The vast majority of our Milky Way's stars had not yet been born. Yet the heavens were ablaze with a firestorm of new star formation.
By tracing the Milky Way's siblings, astronomers find that our galaxy built up most of its stars between 11 billion and 7 billion years ago. The Hubble telescope's superb resolving power allowed the researchers to study how the structure of Milky Way-like galaxies changed over time. The observations suggest that our galaxy's flat disk and central bulge grew simultaneously into the majestic spiral galaxy of today.See the rest:
Credit: NASA, ESA, P. van Dokkum (Yale University), S. Patel (Leiden University), J. Leja, E. Nelson, R. Skelton, and I. Momcheva (Yale University), G. Brammer (European Southern Observatory), K. Whitaker (NASA Goddard Space Flight Center), B. Lundgren (University of Wisconsin, Madison), M. Fumagalli (Leiden University), C. Conroy (University of California, Los Angeles), N. Schreiber (Max Planck Institute for Extraterrestrial Physics), M. Franx (Leiden University), M. Kriek (University of California, Berkeley), I. Labbe (Leiden University), D. Marchesini (Tufts University), H. Rix and A. van der Wel (Max Planck Institute for Astronomy), S. Wutys (Max Planck Institute for Extraterrestrial Physics), and the 3D-HST Team