There’s a deep connection between gravity and time - gravitational fields seem to slow the pace of time in what we call gravitational time dilation. And today we’ll explore the origin of this effect. And ultimately, we’ll use what we...

When we scan the heavens with giant telescopes we see galactic cannibalism everywhere. We see moments that appear frozen on the human timescale, but are really snapshots of the incredibly violent process of galaxy formation. This is how...

We've been through the first few episodes of our crash course on general relativity, and came out alive! But it's officially "time" for CURVED spacetime. Join Gabe on this week's episode of PBS Space Time as he discusses Newton and...

Most of us take gravity as an assumed part of our living realities, but why? Basic physics introduces us to the concept of gravity from a Newtonian sense, but when you start factoring Einstein into an understanding of gravity, things get...

Forces are like friends… some are real and some are fake! This lesson will distinguish between real and fictitious forces.

Definitions included: frame of reference, inertial frame of reference, non-inertial frame of reference, real...

Princess Lotus and Markio battle for 1st place – until the game is interrupted by an unexpected visitor. This lesson will show you how to solve 3 common types of 2D relative velocity questions.

Definitions included: frame of...

A massive sinkhole appears in the middle of Central Park! Which superhero will be the first to respond? This lesson will explain how to calculate the relative velocity of an object in different inertial frames of...