Uploaded June 2026 | Updated September 2026, 2 weeks ago

---

Check out the Rocks Box store and subscribe here: complexly.info/rocks

From hanging a plumbob near a Scottish mountain, to watching a starless world act like a planet-sized lens from two vantage points at once, scientists have devised a lot of ways to calculate a planet's mass.

Hosted by: Reid Reimers (he/him)
----------
Support us for $8/month on Patreon and keep SciShow going!
patreon.com/scishow
Or support us directly: complexly.com/support
Join our SciShow email list to get the latest news and highlights:
https://mailchi.mp/scishow/email
----------
Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Shaji John, Timos Gies, Jon Coffman, Anita, Anne Herrington, Ashley Moquin, yeyette, David Johnston, Cye Stoner, Jp Lynch, Bethany Matthews, Chris Curry, J.V. Rosenbalm, Blood Doctor Kelly, Toyas Dhake, Reed Spilmann, Garrett Galloway, Friso, Lyndsay Brown, Jeremy Mattern, Jaap Westera, Matt Curls, Eric Jensen, Chris Mackey, Adam Brainard, Piya Shedden, Steve Gums, Alex Hackman, Kevin Knupp, Chris Peters, Kevin Bealer, Joseph Ruf, Jason A Saslow
----------
Looking for SciShow elsewhere on the internet?
SciShow Tangents Podcast: scishow-tangents.simplecast.com
TikTok: tiktok.com/@scishow
Instagram: instagram.com/thescishow
Facebook: facebook.com/scishow
Bluesky: https://bsky.app/profile/scishow.bsky.social

#SciShow #science #education #learning #complexly
----------
Sources: docs.google.com/document/d/e/2PACX-1vTRCDF7sigbPRmlnZRJtrPRlt-XvpdxZtICzvhifv_ST5FAhhitx6RoFrnQ-fBhSA-h29auUb9pnSuX/pub