[u801e]

I've read that it's the same case with Venus' core, but its atmosphere is far more dense than either Earth's or Mars'.

[Scaevolus]

Venus has an induced magnetic field that may protect its atmosphere. https://www.astrobio.net/also-in-news/a-magnetic-surprise-fr...

[nonbel]

Apparently so does Mars though? http://www.sciencedirect.com/science/article/pii/S0019103509...