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Which force dominates the motion of planets around stars?
Quick Answer
Gravity dominates the motion of planets around stars. It keeps planetary systems bound and determines orbital paths.
The Full Story
Planetary motion is governed primarily by gravity. The balance between a planet’s forward motion and the star’s gravitational pull produces an orbit. This same force explains tides, comet trajectories, and the structure of the Solar System. Newton first captured the mathematics of orbital motion, and later observations confirmed that gravity scales from apples falling to planets circling stars.
Key Facts
1.Planetary orbits are gravitationally bound
2.Newton’s law of gravitation dates to 1687
3.Earth travels around the Sun at about 29.8 km/s
YouTube Angle
Suggested video title for this topic:
"Why planets keep circling instead of crashing"
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