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School
Washington State University *
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Course
240
Subject
Astronomy
Date
Dec 6, 2023
Type
docx
Pages
2
Uploaded by HighnessHeronPerson994
Learning goal one
Explain how Astronomers. discovered the size and spiral structure of the Milky Way Galaxy.
The distance to globular. clusters can be found from the luminosity of variable stars within
them. Because those globular clusters are symmetrically distributed around the center of the
Milky Way Galaxy, the center of the distribution is located at the center of the Galaxy. The sun is
located around 8300 PC or 27,000 light years from the Milky Way Center. And the Milky Way is
30,000 PC or 100,000 light years across. Radio observations of neutral hydrogen gas and
observations of star forming nebulae provide evidence of the Milky Way spiral structure.
learning goal 2
List of clues of Galaxy formation that can be found from the components of the Milky Way.
The chemical composition of the Milky Way has evolved as material has cycled between stars
and the interstellar medium. Its generation of stars must have existed before the formation of
the oldest Halos in globular cluster stars we see today. The Milky Way has a disc that has two
parts. The thick old disc. And the thin new disk of young stars, implying that gas and dust from
merging galaxies settled into the disc. While the stars have passed through. The galactic Halo
consists of an inner Halo announcer, Halo of stars in globular clusters, as well as a large hot gas
Halo. The abundance of heavy elements in the Milky Way has increased as each generation of
stars has produced more of those elements during the final phases of the stars lives.
learning goal 3
Explain the evidence for the dark matter Halo and for the supermassive black hole at the center
of the Milky Way.
The Doppler velocities of radio spectral wave show that their rotation curve of the Milky Way is
flat, like those of other galaxies, but the infrared mass cannot be accounted for by the mass as
observed directly. That finding indicates that the Milky Way's mass is mostly in the form of dark
matter. Evidence for the black hole at the center of the Galaxy includes rapid orbital velocities of
nearby stars and symmetric X Ray and gamma Ray overflows of material from the center.
learning goal 4
Describe the local group of galaxies and how it offers clues about the evolution of the Milky
Way.
The Milky Way is part of the local group of galaxies, which consists of two large, barred spirals
and several dozen smaller galaxies. Collisions and mergers between those galaxies probably
happened in the past, and a merger with the Andromeda Galaxy must be part of the Milky
Way's future. The dwarf satellites and other neighborhoods in the local Galaxy are evidence that
the Milky Way is growing through accretion.
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