![]() Yet this distinction alone is not enough to fully explain what nebulae are and how they work. Today, astronomers know that galaxies and nebulae are unique objects with different characteristics. Specifically, he observed that the Andromeda spiral nebula was actually a spiral galaxy. Then, in the 1920s, American astronomer Edwin Powell Hubble, using the most powerful telescope of his day, discovered that many of the objects believed to be vague, indistinct clouds were in fact galaxies. Some were called spiral nebulae others were called elliptical nebulae. The telescopes of the day revealed very little detail about these objects, but astronomers could see enough to know that these nebulae came in different shapes. Until the 20th century, astronomers used the term nebula to describe any glowing, cloud-like object observed from Earth. A single such cloud is a nebula, which is Latin for "mist" or "cloud." Sometimes, this interstellar matter is collected in such a way that it's visible to Earth-bound observers, either as a glowing cloud or as a dark silhouette against a lighter background. It's filled with dust and gases, what astronomers call interstellar matter. In reality, the great emptiness that exists between the Sun and Aldebaran is not empty at all. Nebulae, such as the Hourglass Nebula can inspire awe and wonder. ![]()
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