108 Chapter 2 From the Solar System to the Milky Way
Top Five Mysteries of the Galaxy That Have Not Yet Been
Explained!
Astronomers and astrophysicists are still exploring our solar system and galaxy.
What Is the Galaxy’s Shape, and How Did It Form?
Previously, the Milky Way was considered a spiral galaxy. However, American astronomers
analyzed observational data from the Spitzer Space Telescope, which was launched by NASA
in 2003, and concluded that a bar structure approximately 27,000 light-years long runs
through the center of the Milky Way. A barred spiral galaxy is a type of spiral galaxy but one
that looks as though the spiraling arms ha ...
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