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Escaping Gravity

3 sessions, in order

Three sessions on falling and getting away: an orbit is falling and missing, a fast enough throw never comes back, and a black hole is where even light can't throw hard enough.

1.P&A-5Newton's Cannonball CrewPhysics & Astronomy~32 minWhat is an orbit, really? Falling forever, thanks to the balance between gravity and inertia.
2.P&A-62The Throw That Never Comes DownPhysics & Astronomy~27 minCan you throw something so hard it never comes back? Why gravity's fading pull sets a leaving speed for every world, from Earth's 11.2 km a second to a comet you could jump off.
3.P&A-27The Point of No ReturnPhysics & Astronomy~30 minWhat actually happens at the edge of a black hole? The event horizon, and why nothing, not even light, escapes it.