Galaxy was derived from the French, Greek, and Latin words for milk. To pre-industrial people, lacking Physicists Wilson and Penzias received the Nobel prize for their discovery of the ? Matter originally filled all of space when the universe was very young 2. Earth, Solar System, Virgo Galaxy, Virgo, Andromeda Supercluster. Spirals are known for their non-stop star births and deaths, seen here in (false color) pink by the VLA. relationship between energy and matter (E = mc 2) ? The study of this phenomenon is called color evolution. Individual galaxies generally evolve through one of three ways:. Galaxies that pass near each other can be captured in their mutual self-gravity and merge into a new galaxy. Computer simulations also indicate that the epoch right after galaxy formation is a time filled with many encounters/collisions between young galaxies. Lagadec 2008. Planetary nebula formation and evolution ... O-AGB winds are dust-driven in Galaxy but not in the SMC ? The clouds began collapsing because their internal gravity was strong enough to overcome the pressure in the cloud. 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. These galaxies become steadily fainter and redder as the brighter, high mass (bluer) stars exit the main sequence and evolve into red giants. The best models for galaxy formation assume: 1. The "top-down" model on the origin of the galaxies says that they formed from huge gas clouds larger than the resulting galaxy. A galaxy is an island of stars floating on a plate of dark matter, or so the theory goes. Passive Evolution in which the galaxy remains undisturbed by mergers or interactions, and is devoid of ongoing star formation. Models for galaxy formation have been of two basic types: "top-down" and "bottom-up". A tiny fraction of this energy, if absorbed by the host galaxy, could halt star formation by heating and ejecting ambient gas. A central question in galaxy evolution is the degree to which this process has caused the decline of star formation in large elliptical galaxies, which typically have little cold gas and few young stars, unlike spiral galaxies. The Whirlpool Galaxy is a spiral galaxy like our own Milky Way Galaxy. 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. Galaxy formation is hypothesized to occur from structure formation theories, as a … absorbed by the host galaxy, could halt star formation by heating and ejecting ambient gas. Big Bang theory of the universe ? 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