Escape velocity is the minimum speed needed for an object to break free from a celestial body's gravitational pull without further propulsion. For Earth: v_e = √(2GM/R) ≈ 11.2 km/s (40,300 km/h).
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A black hole is an object whose escape velocity exceeds the speed of light (300,000 km/s). Even light cannot escape, which is why they appear black.
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