What is the difference between a galaxy and a nebula? How do astronomers tell them apart?
Galaxy is a system of widely separated star systems, held together gravitationally. Nebula is a misty cloud of dust and gas, capable of hiding a single or a system of space bodies.
Astronomers can tell which is which from the definitions.
Galaxies are spaced widely apart.
A galaxy may contain nebulae.
They can be seen as a cloud of gas and dust in the night sky, in outer
space, in contrast to bright bodies, is like a broken patch.
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Galaxies are massive systems composed of stars, stellar remnants, gas, dust, and dark matter, bound together by gravity. Nebulae are clouds of dust, hydrogen, helium, and other ionized gases. Astronomers differentiate them based on their size, composition, and structure. Galaxies are typically much larger and contain billions to trillions of stars, while nebulae are smaller and usually do not contain as many stars. Additionally, galaxies have well-defined structures, such as spiral arms or elliptical shapes, while nebulae often have irregular or diffuse shapes. Astronomers use telescopes and observational techniques to study the characteristics and properties of these celestial objects, such as their spectral signatures, morphology, and motion, to distinguish between galaxies and nebulae.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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