Milky Way Galaxy (sometimes simply called the Galaxy), large spiral system of about several hundred billion stars, one of which is the Sun. It takes its name from the Milky Way, the irregular luminous band of stars and gas clouds that stretches across th
Size and compositionSchematic illustration showing the galaxy in profile.The stellar disk of the Milky Way Galaxy is approximately 69 in diameter, and is, on average, about 69 thick.[11] As a guide to the relative physical scale of the Milky Way, if it were reduced to 69 in diameter, ...
Astronomers reanalyzed the chemical composition of three stars in the Milky Way's halo and found that they are between 12 and 13 billion years old. They may have also been stolen from other galaxies. Three alien stars circling the Milky Way could be some of the oldest ever found in the ...
according torecent NASA estimates. The galaxy's visible matter is distributed between its 200 billionstars, their planets and the massive clouds of dust and gas that fill the interstellar space. Astronomers aren't quite sure how many planets are in the Milky Way, given we have only found a ...
Our Galaxy’s stellar age–metallicity distribution The photospheric metallicity of any subgiant star of ageτreflects the element composition of the gas from which it formed at the epochτ Gyr ago. The overall distribution of these stellar metallicities at different epochs,p(τ, [Fe/H]), th...
Majewski, S.R.: Galactic structure surveys and the evolution of the Milky Way. Ann. Rev. Astron. Astrophys. 31, 575 (1993) Article ADS Google Scholar Makarov, D., Karachentsev, I.: Galaxy groups and clouds in the local (z ∼ 0. 01) Universe. Mon. Not. R. Astron. Soc...
Within the past decade it is being increasingly recognized that many of the clues to the fundamental problem of galaxy formation in the early Universe are contained in the motions and chemical composition of long-lived stars in our Milky Way galaxy. The growing awareness of the importance of ...
Schematic diagram showing two stages of star formation in the Milky Way galaxy according to Noguchi. In upper illustration, blue (cold) and red (hot) indicate gas. The color map in bottom panel shows distribution of the elemental composition of stars calculated by Noguchi’s model with the pur...
Galactic structure surveys and the evolution of the Milky Way Galactic StructureMilky Way GalaxyStellar CompositionAstrometryStellar EvolutionStellar MotionsThe evolution of the Milky Way is investigated from surveys of ... Majewski,R S. - 《Annual Review of Astronomy & Astrophysics》 被引量: 166发表...
et al. The Milky Way has no in-situ halo other than the heated thick disc. Composition of the stellar halo and age-dating the last significant merger with Gaia DR2 and APOGEE. Astron. Astrophys. 632, A4 (2019). Article Google Scholar Vincenzo, F. et al. The fall of a giant. ...