How can we create a magnetosphere on Mars?

Before I speculate on creating a magnetic field around Mars, let me just say that Mars actually does have an extremely weak magnetic field (~40 times weaker than Earth's) but only in the southern hemisphere. read more

You will need two nuclear reactors and tens of thousands of miles of conducting wire. Since we know that iron exist in large quantities in the Martian regolith (which is why Mars is red in color) let’s make the wire in situ on Mars. read more

First we would have to somehow liquefy the outer core of the planet. Then the planet’s own rotation would create a dynamo and generate a magnetic field like Earth’s. read more

One key aspect of terraforming Mars is to protect the atmosphere (both present and future-built) from being lost into space. Some scientists hypothesize that creating a planet-wide artificial magnetosphere would be helpful in resolving this issue. read more