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Galactic astronomy - Wikipedia Galactic astronomy is the study of the Milky Way galaxy and all its contents This is in contrast to extragalactic astronomy, which is the study of everything outside our galaxy, including all other galaxies
Galaxies - NASA Science Galaxies consist of stars, planets, and vast clouds of gas and dust, all bound together by gravity The largest contain trillions of stars and can be more than a million light-years across The smallest can contain a few thousand stars and span just a few hundred light-years
Galaxy | Definition, Formation, Types, Properties, Facts | Britannica A galaxy is any of the systems of stars and interstellar matter that make up the universe Many such assemblages are so enormous that they contain hundreds of billions of stars Galaxies usually exist in clusters, some of which measure hundreds of millions of light-years across
Astronomy and Space Science: Galactic Astronomy - Encyclopedia. com The study of our galaxy has always been complicated by the fact that we are inside it, and the story of galactic astronomy is largely the story of how astronomers solved the problem of what we would look like from afar
Cosmology - Harvard–Smithsonian Center for Astrophysics Cosmologists study the large-scale structure and BAO to measure the rate of cosmic expansion and understand how galaxies are organized on the largest scales All the atoms in the universe only make up about 5% of its total contents
What is a galaxy? - BBC Sky at Night Magazine What is a galaxy, and what are the different types found in the Universe? Find out about galaxy formation and the history of their study
Astrophysics - Galactic Astronomy - Space@Hopkins Detailed study of the nearby universe will have profound implications on both Extragalactic Astronomy and Cosmology These projects involve both observational and theoretical efforts
Galaxies | NASAs UoL Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity NASA’s space telescopes have revealed intricate details of the shapes, structures, and histories of galaxies — whether alone, as part of small groups, or within immense clusters
What is Astronomy? | Department of Astronomy What is Astronomy? Astronomy and Astrophysics is the study of planets, stars, galaxies, and the Universe as a whole This includes how all of these originate and their evolution in time
DOE Explains. . . Cosmology - Department of Energy Cosmology studies how the history of the universe led to the stars, galaxies, and other features we can observe today Cosmology is the study of the origin, development, structure, history, and future of the entire universe In modern science, cosmology is divided into two branches