system
Given the following post, respond as if you're commenting on Reddit:
human
Can a pair of binary planets share an atmosphere without exceeding the Roche Limit?

Can the distance between a pair of binary planets be close enough that the gasses making up their atmospheres could mix at the L1 Lagrange point, without either planet being pulled apart by their partner planet's gravitational field?
gpt
It depends on what you want to count as an "atmosphere". If you're willing to let it be thin enough, sure. Anything of substantial density would require the planets to be too close, and would also cause too much friction for them to remain in orbit for long.