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Tides and Tidal Forces. Near Satellites Orbit Faster. What If Satellites Are Tethered?. The Tension Is Real. There are Two Tidal Bulges on Earth. Both Moon and Sun Cause Tides. Tides on the Real Earth. Tidal Friction. Tides Affect Earth and Moon . Tides and the Earth-Moon System. - PowerPoint PPT Presentation
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Tides and Tidal Forces
Near Satellites Orbit Faster
What If Satellites Are Tethered?
The Tension Is Real
There are Two
Tidal Bulges
on Earth
Both Moon and Sun Cause Tides
Tides on the Real Earth
Tidal Friction
Tides Affect Earth and
Moon
Tides and the Earth-Moon System• Moon retreating at 4 cm/yr• Day currently lengthening by 2 sec/100,000 yr• Fossil organisms and some rocks preserve
tidal records• 600 million years ago– Day was 22 hours long– 400 days/year– Moon 13,000 km closer– Rate of change not constant
Tides and Planets• All satellites are locked to their parent planets• Large tides can heat planetary interiors• Tidal forces change orbital eccentricity• Most satellites– Planet rotation slows– Moon moves outward– Can “leak” away (Deimos)
• Retrograde Satellites– Satellite moves inward (Triton)