- Galaxy | Definition, Formation, Types, Properties, Facts | Britannica
Galaxy, 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 Virtually all galaxies appear to have been formed soon after the universe began, and they pervade all space that is viewable by modern telescopes
- Galaxies - NASA Science
Our home galaxy is called the Milky Way It’s a spiral galaxy with a disk of stars spanning more than 100,000 light-years Earth is located along one of the galaxy’s spiral arms, about halfway from the center Our solar system takes about 240 million years to orbit the Milky Way just once
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