The distribution of matter was not perfectly uniform– some slightly denser than the others– and this slightly greater pull of gravity wins the expansion. Planetary nebula formation and evolution ... O-AGB winds are dust-driven in Galaxy but not in the SMC ? afterglow of the creation of the universe ? Galaxy Classification & Evolution Laboratory Lab 12 1 name Galaxy Classification and Evolution The word “galaxy,” having been used in English since the fourteenth century, is as old as this language. Big Bang theory of the universe ? It is likely that the filamentary distribution of galaxies and voids was built in near the beginning, … The challenge for galaxy formation theories is to show how this “not quite” smooth distribution of matter developed the structures—galaxies and galaxy clusters—that we see today. Galaxy was derived from the French, Greek, and Latin words for milk. Galaxy formation is hypothesized to occur from structure formation theories, as a … The clouds began collapsing because their internal gravity was strong enough to overcome the pressure in the cloud. Other winds Need to predict right mass loss … relationship between energy and matter (E = mc 2) ? The best models for galaxy formation assume: 1. In about 1 … The study of galaxy formation and evolution is concerned with the processes that formed a heterogeneous universe from a homogeneous beginning, the formation of the first galaxies, the way galaxies change over time, and the processes that have generated the variety of structures observed in nearby galaxies. Physicists Wilson and Penzias received the Nobel prize for their discovery of the ? Passive Evolution in which the galaxy remains undisturbed by mergers or interactions, and is devoid of ongoing star formation. Spirals are known for their non-stop star births and deaths, seen here in (false color) pink by the VLA. The "top-down" model on the origin of the galaxies says that they formed from huge gas clouds larger than the resulting galaxy. Earth, Solar System, Virgo Galaxy, Virgo, Andromeda Supercluster. Matter originally filled all of space when the universe was very young 2. A galaxy is an island of stars floating on a plate of dark matter, or so the theory goes. Models for galaxy formation have been of two basic types: "top-down" and "bottom-up". Computer simulations also indicate that the epoch right after galaxy formation is a time filled with many encounters/collisions between young galaxies. The Whirlpool Galaxy is a spiral galaxy like our own Milky Way Galaxy. A tiny fraction of this energy, if absorbed by the host galaxy, could halt star formation by heating and ejecting ambient gas. To pre-industrial people, lacking These galaxies become steadily fainter and redder as the brighter, high mass (bluer) stars exit the main sequence and evolve into red giants. 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