In physics, it can sometimes help to imagine a challenging problem as easier problem we already know how to solve. What if you're free falling from outer space? What if you're falling through a tunnel drilled through the Earth? Brilliant for 20% off: http://brilliant.org/ScienceAsylum
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RELATED YOUTUBE VIDEOS

MinutePhysics on Earth Tunnels:
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   • How Long To Fall Through The Earth?  

Fraser Cain on Earth Tunnels:
   • What If We Dug A Tunnel Through The E...  
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OTHER SOURCES

https://spaceflight.nasa.gov/shuttle/...
https://imagine.gsfc.nasa.gov/feature...
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https://www.usgs.gov/specialtopic/wa...
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