Editing Planetary Engineering: Stellar Engines and Cosmic Megaprojects (section)

== <span style="color: #FFFFFF;">Understanding</span> ==
Planetary engineering is understood through '''Leverage''' and '''Timescale'''.

'''1. The "Star" Sail (Shkadov Thruster)''':
"Moving the Sun, one photon at a time."
* (See Article 123). **Photons** "Carry" **"Momentum"** (Radiation Pressure).
* A "Giant Mirror" "Reflects" "Half" of the "Sun's Light" "Back" at the "Sun."
* This "Pushes" the "Star" in the "Opposite Direction."
* Over **"Millions of Years"**, this "Moves" the "Star" "Significantly" — enough to "Escape" a "Dangerous Supernova Region."
* "Safety" is **"A Mirror."**

'''2. The "Caplan" Engine (Fusion + Tractor)''':
"Turbocharged Star Moving."
* (See Article 589). The **Caplan Thruster** "Combines" a **"Dyson Sphere"** with a **"Fusion Engine"** (Fuel from Stellar Wind).
* It "Can" "Move" the "Sun" **"100x Faster"** than the "Shkadov Thruster."
* "A Solar System" could "Be" **"Relocated"** in "5 Million Years."
* "Engineering" is **"Patient."**

'''3. The "System" Redesign (Sculpting)''':
"Rearranging the Furniture."
* (See Article 688). "Gravity Assists" and "Mass Drivers" can "Slowly" "Move" **"Asteroids and Comets"** to "New Orbits."
* A "Civilization" could **"Deliver Water"** to an "Arid Mars" by "Diverting" "Ice Comets."
* Over "Millions of Years," a "Star System" can be **"Optimized"** for "Maximum Habitability."
* "The Solar System" is **"A Garden."**

'''The 'Caplan' Paper (2019)'''': Matthew Caplan "Published" a "Detailed" "Feasibility Analysis" of a **"Combined Stellar Engine"** that "Uses" "Existing Physics." It proved that "Moving Stars" is **"Not Science Fiction"** but "Speculative Engineering" — a "Critical Distinction."
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