by Jonathan Sarfati
Creation Ministries International

The earth has a magnetic field pointing almost north-south—only 11.5° off. This is an excellent design feature of our planet: it enables navigation by compasses, and it also shields us from dangerous charged particles from the sun. It is also powerful evidence that the earth must be as young as the Bible teaches.

In the 1970s, the creationist physics professor Dr Thomas Barnes noted that measurements since 1835 have shown that the field is decaying at 5% per century1 (also, archaeological measurements show that the field was 40% stronger in AD 1000 than today2). Barnes, the author of a well-regarded electromagnetism textbook,3 proposed that the earth’s magnetic field was caused by a decaying electric current in the earth’s metallic core (see side note). Barnes calculated that the current could not have been decaying for more than 10,000 years, or else its original strength would have been large enough to melt the earth. So the earth must be younger than that.

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