wunder beta🛰️ How satellites stay in orbit
Follow gravity, sideways speed, orbital height, mission-specific paths, and small corrections to see how satellites keep circling Earth instead of falling or flying away.
What you’ll learn
- Gravity makes the curveExplain how gravity and sideways velocity combine to create an orbit.Satellites are continuously falling toward Earth, but their forward motion bends that fall into a repeating path.
- Height sets the paceRelate orbital altitude to speed, period, drag, and practical mission choices.Lower orbits are faster and more affected by drag, while higher orbits are slower, larger, and longer-period.
- Mission chooses the pathCompare polar, sun-synchronous, geostationary, and inclined orbits by their uses.The orbital plane and its relationship to Earth’s rotation determine what a satellite can see and how it serves people.
- Small corrections keep it usefulDescribe orbital disturbances, maneuvers, tracking, and responsible end-of-mission planning.Real spacecraft need measured, timed velocity changes and coordinated operations to keep their paths safe and useful.
Questions this course answers
Why does a satellite not simply fall straight down to Earth?
Gravity pulls inward while sideways velocity carries the satellite forward, producing a curved path that keeps missing Earth.
What generally happens to circular orbital speed when altitude increases?
Higher circular orbits are larger and have weaker gravity, so the required orbital speed is lower and the trip takes longer.
Why is a polar orbit useful for Earth observation?
The satellite follows a near north-south path while Earth turns underneath, building broad coverage over time.
What makes a geostationary satellite appear fixed in the sky?
Matching Earth’s rotation requires the right altitude, circular equatorial path, and eastward direction.
Grounded in trusted sources
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