= Astronomical objects
{wiki=Astronomical_objects}
Astronomical objects are natural entities located outside the Earth's atmosphere that can be observed and studied in the field of astronomy. They encompass a wide variety of celestial phenomena and structures, including: 1. **Stars**: Massive, luminous spheres of plasma held together by gravity. They are the building blocks of galaxies and come in various types and sizes. 2. **Planets**: Large celestial bodies that orbit stars. They can be rocky like Earth and Mars or gaseous like Jupiter and Saturn.
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