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negativefactor writes:

Scientists at CERN have begun testing a new prototype coil made of magnesium diboride (MgB2), which they hope will be the precursor to an active magnetic shield for space craft travelling in deep space. Although current space craft are capable of shielding radiation from Sol, the shield must protect against galactic cosmic rays.

From the article:

During long-duration trips in space and in the absence of the magnetosphere that protects people living on Earth, astronauts are bombarded with high-energy cosmic rays that might cause a significant increase in the probability of various types of cancers. Because of this, exploration missions to Mars or other distant destinations will only become realistically possible if an effective solution for adequately shielding astronauts is found. ...

There are many more challenges to overcome before a spacecraft shield can be built: various possible magnetic configurations need to be tested and compared and other key enabling technologies need to be developed. But the MgB2 superconductor seems to be very well-placed to take part in this challenging adventure as, among its many advantages, there is also its ability to operate at higher temperatures (up to about 25 K) thus allowing the spacecraft to have a simplified cryogenic system.

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