Which Way Is Down?

Links to sources and to learn more below!

my twitter
my instagram

Thanks to Eric Langlay ( for producing, editing, and animating this episode with me. Thanks also to Henry Reich ( for his advice and guidance.

Universe Sandbox² :

Mass vs weight:
Great Veritasium video:
two other great videos: and

baseballs coming together under gravitational attraction can be simulated in Universe Sandbox 2. More math behind it can be found here:

Weight to mass (on surface of Earth) convertor:

pencil and Earth falling numbers:

NASA HD footage:


Earth’s spin and its effect on ‘down’:

The measurement of Earth and its gravity:

Movement of Earth’s center of mass:

you get heavier before you get lighter as you descend into Earth:

vertical deflection:

practical uses of measuring gravity:


Interactive Earth geoid:

your weight when moon is overhead:

Hammer and feather drop on moon:

Why things fall at the same rate:

Wolfram Alpha cone geodesic tool:

General Relativity:

simple animation showing geodesic on cone and how it causes motion DOWN in space:
GREAT pbs spacetime video (watch the whole channel):

Q: Why does “curved space-time” cause gravity?

time and gravity:

Bending of space not responsible for objects falling down? from askscience

Does Time Dilation cause Gravity or the other way around? from AskScienceDiscussion

tests of general relativity:


great introductory texts:

“Relativity Visualized” by Lewis Carroll Epstein

There’s also this PDF that takes Epstein’s diagrams into more detail:

“Relativity Simply Explained” by Martin Gardener

great intro to the math of general relativity:

“A Most Incomprehensible Thing: Notes Towards a Very Gentle Introduction to the Mathematics of Relativity” by Peter Collier

Requires some background in relevant math topics (see above) but very very good:

“Spacetime And Geometry: An Introduction To General Relativity” by Sean Carrol

Leave a Reply

Your email address will not be published. Required fields are marked *

Related Posts

Storm Ophelia makes landfall in Ireland

The former hurricane has reached the west coast of Ireland, with winds of up to 95mph (150km/h). More than one person has died, while hundreds of thousands of homes and businesses in southern Ireland are without power • Storm Ophelia – live coverage View the video at

(SPOILERS) ‘Shiva Saves the Day’ Talked About Scene Ep. 804 | The Walking Dead

Shiva arrives just in time as King Ezekiel attempts to take out an army of walkers. #TheWalkingDead #TWD #AllOutWar For more The Walking Dead videos: (SPOILERS) Talked About Scene from The Walking Dead: Season 8, Episode 4 Subscribe to the AMC YouTube Channel : The Walking Dead: Sign Up for the The […]

Foster The People – Sit Next to Me (Official Video)

Experience the “Sit Next to Me” video best on your mobile phone. Foster The People’s new album ‘Sacred Hearts Club’ is available now: iTunes: Spotify: Amazon: Google Play: Apple Music: Follow the band: Tweets by fosterthepeople Production Company: PRETTYBIRD Pictures Director: Fourclops & Brinton Bryan Executive […]

FANTASY (feat. Amber Liu) by SUPERFRUIT

Thanks to Amber Liu for being in this video! FUTURE FRIENDS THE ALBUM – OUT NOW! “FANTASY” Directed by Scott Hoying, Mitch Grassi, Lindsey Blaufarb, Crag Hollamon Featuring Amber Liu Choreographed by Lindsey Blaufarb and Craig Hollamon Styled by Candice Lambert HMU by Genevieve Lamb FUTURE FRIENDS TRACK LIST: 1. IMAGINARY PARTIES 2. BAD […]

First Time Flying | Lele Pons

WATCH MY LAST VIDEO ▶ SUBSCRIBE HERE ▶ THANKS FOR WATCHING! 🙂 LIKE & SUBSCRIBE FOR MORE VIDEOS! ———————————————————– FIND ME ON: Instagram | Twitter | Facebook | Snapchat | CAST: Lele Pons | Kyle Massey | Hana Giraldo | Fiammetta Cavatorta | Shots Studios […]

H&M Holiday 2017 starring Nicki Minaj – official teaser

H&M is pleased to announce that the 2017 Holiday campaign film will star Nicki Minaj alongside Jesse Williams and John Turturro. Directed by Johan Renck, the film tells a story of a parallel fantasy world filled with memorable characters and a universal message of caring for one another. The full film will be released November […]

The owner of this website is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon properties including, but not limited to,,,,, or
Home Privacy Policy Terms Of Use Medical Disclaimer Contact Us Affiliate Disclosure DMCA Earnings Disclaimer