Formation of the Milky Way

Front

What is dark matter?

Back

Dark matter is a form of matter that does not emit, reflect, or absorb light, making it invisible and detectable only through its gravitational effects.

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How can dark matter be detected?

Back

Dark matter can be detected when galaxies collide, as the gravitational effects of dark matter influence the motion of visible matter.

Front

What is Kepler's third law?

Back

Kepler's third law states that the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.

Front

How can Kepler's third law be modified for galaxies?

Back

Kepler's third law can be modified to apply to the mass of stars orbiting in a galaxy, relating their orbital periods to their distances from the galactic center.

Front

What is the structure of the Milky Way?

Back

The Milky Way has at least 5 major spiral arms, which are regions of higher density of stars and gas.

Front

How do stars orbit in the Milky Way?

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The vast majority of stars in the Milky Way orbit in mostly one direction around the central bulge.

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What role does dark matter play in galaxy formation?

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Dark matter provides the gravitational framework necessary for the formation and stability of galaxies.

Front

What evidence supports the existence of dark matter?

Back

Evidence for dark matter includes the rotation curves of galaxies, gravitational lensing, and the cosmic microwave background.

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What is the significance of spiral arms in galaxies?

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Spiral arms are significant as they are regions of star formation and contain a higher concentration of gas and dust.

Front

What is the central bulge of the Milky Way?

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The central bulge of the Milky Way is a dense region of stars located at the center of the galaxy, containing older stars and possibly a supermassive black hole.