00:01
So we have this orbit here.
00:03
You have a star here, a star here.
00:07
So this is the force of gravity and this is the force of gravity.
00:11
So, and we have this distance here being defined as d.
00:19
A asks why the two stars don't crash into each other.
00:22
The two stars don't crash into each other because they're in circular motion.
00:26
So undergo uniform circular motion.
00:38
And the gravitational force, gravitational force is centripetal and maintains that motion, maintains this motion.
01:07
So at this point, if the gravitational force is centripetal and maintains this motion, they're not going to crash into each other.
01:16
This is why, because if they're perfectly on the opposite sides of this orbit here, that means that their force of gravity is always going to be parallel but opposite to one another...