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The Milky Way is a barred spiral galaxy with a D 25 isophotal diameter estimated at 26.8 ± 1.1 kiloparsecs (87,400 ± 3,600 light-years), [10] but only about 1,000 light-years thick at the spiral arms (more at the bulge).

May 25, 2025 · Milky Way Galaxy - Structure, Dynamics, Stars: The first reliable measurement of the size of the Galaxy was made in 1917 by American astronomer Harlow Shapley. He arrived at his size determination by establishing the spatial distribution of globular clusters.

Nov 8, 2017 · Using infrared images from NASA's Spitzer Space Telescope, scientists have discovered that the Milky Way's elegant spiral structure is dominated by just two arms wrapping off the ends of a central bar of stars.

The 1.2 Meter Millimeter-Wave Telescope (MWT) at the Center for Astrophysics | Harvard & Smithsonian is dedicated to mapping the locations of these clouds in the Milky Way, which reveals details about the structure of our home galaxy and its star-forming capabilities.

In the case of our Milky Way Galaxy, we can see about 200 billion solar luminosities worth of light. If the Milky Way were made of ordinary stars like the Sun, we would expect it to have roughly 200 billion solar masses of material.

Apr 28, 1999 · The Milky Way system is a spiral galaxy consisting of over 400 billion stars , plus gas and dust arranged into three general components as shown to the left: The halo - a roughly spherical distribution which contains the oldest stars in the Galaxy, The nuclear bulge and Galactic Center.

Sep 1, 2019 · On the left, a face-on view shows the spiral structure of the Galactic Disc, where the majority of stars are located, interspersed with a diffuse mixture of gas and cosmic dust. The disc measures about 100 000 light-years across, and the Sun …

Strategies to Explore the Structure of the Milky Way . 1. Select bright objects that you can see throughout the Milky Way and trace their directions and distances. 2. Observe objects at radio and infrared wavelengths to circumvent the problem of optical obscuration, and catalog their directions and distances. 3.

The Milky Way Galaxy can be though of as three components: a bright bulge of stars at the center of the Galaxy orbiting a massive black hole, a disk of gas, dust, and bright, young stars that rotates around the core, and a large, nearly spherical halo of old stars, compact stellar clusters called globular clusters, and dark matter.

The Milky Way Galaxy consists of a thin disk containing dust, gas, and young and old stars; a spherical halo containing populations of very old stars, including RR Lyrae variable stars and globular star clusters; a thick, more diffuse disk with stars that have properties intermediate between those in the thin disk and the halo; a peanut-shaped ...