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What effects does dark matter have on galaxies?

Answer 1

Dark matter is needed to explain observations. It is a hypothesis, yet unconfirmed.

Observing matter in the universe through telescopes allows one to calculate its mass, but observing the motion of galaxies indicates that their mass is assumed to be greater than that which is observed. This phenomenon is known as dark matter, and it accounts for 85% of matter in the universe. Theories about dark matter range from cold to hot, Wimp (Weakly Interacting Massive Particles) to MACHOS (Massive Compact Halo Objects).

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Answer 2

Clara Avalos

Dark matter does not emit light; instead, it shapes the motion of visible matter, which in turn shapes the structure, rotation curves, and overall dynamics of galaxies. Dark matter shapes galaxy formations and behaviors through gravitational interactions.

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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.