Which of the following contributes the largest percentage to the total mass of a spiral galaxy?

step 1 Hi, everybody. So this one's asking us, which are the following contributions, the largest perce

Which of the following contributes the largest percentage to...

Key Concepts

Dark Matter

Dark matter is a non-luminous form of matter that cannot be directly detected through electromagnetic radiation but is inferred from its gravitational effects on visible matter, radiation, and the large-scale structure of the universe. It is thought to constitute the majority of the total mass in many galaxies, providing the gravitational scaffold that influences their formation and dynamics.

Galactic Mass Distribution

Galactic mass distribution refers to the breakdown of a galaxy's mass among its various components, such as dark matter, stars, gas, and central black holes. In spiral galaxies, understanding this distribution is key to explaining phenomena like rotation curves, where the outer regions rotate at speeds that imply the presence of a massive, unseen component.

Stellar Populations

Stellar populations consist of the stars within a galaxy, which contribute to its visible light and overall structure. Although stars can be very massive collectively, their total mass is typically much less than that of dark matter, which primarily dictates the galaxy’s gravitational potential.

Central Black Holes

Central black holes are supermassive black holes found at the centers of many galaxies. Despite their enormous local gravitational influence, these black holes generally contribute only a small fraction of the total mass of the galaxy when compared to components like the dark matter halo.

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