How are galaxies, clusters, and nebulas different?

Answer 1

Nebula: Interstellar Clouds of Dust, Gas, or Both; Clusters: Please define; Galaxies: Stars, SNR's, Blackholes, Star Clusters, you name it held together by gravity.

Galaxy:

#1.# Reflection (Collections of dust/gas that reflect light)

The second type of emission is similar to reflection, but it is caused by the microwave radiation from a nearby star or stars.

#3.# Planetary (which has nothing to do with planets-rather it's remnants of a low to medium mass star {akin to Supernova, but WAY different})

#4.# Super Nova Remnants (SNR's) (Remnants of Supernova-Like Planetary Nebula)

#5.# Dark Nebula ( Same as Reflective & Emission but they block out all light from behind)

Group:

Star clusters: Groups of stars together

Clusters of Galaxies, or Galaxy Clusters

Basically, groups of any kind

Galaxy:

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Answer 2

Ian Aitchison

Galaxies are large systems of stars, gas, and dust bound together by gravity. Clusters are groups of galaxies held together by gravity. Nebulas are clouds of dust and gas where stars are born.

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Answer from HIX Tutor

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.