Physics, 23.04.2020 20:50 rexard

Planetary orbits about the Sun have slower orbital speed far from the Sun. The rotation curve of our galaxy suggests that orbital speed is constant along the spiral arms. To understand the role of gravity, it has been proposed that our galaxy has mass at great distance from the galaxy center. What does the text identify makes up most of that mass?

A) dark energy
B) stars, protons, neutrons, electrons
C) dark matter
D) none of these

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Planetary orbits about the Sun have slower orbital speed far from the Sun. The rotation curve of our...

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