Neutron stars were first theorized in the 1930s, soon after the discovery of the neutron. In the 1960s, regular radio pulses from space were detected. Their origin was unknown, and some scientists thought these pulses might be evidence of extraterrestrial life. Later, it was discovered that the regular signals were caused by a pulsar, a type of neutron star.
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Karl's association with Space.com goes back to 2000, when he was hired to produce interactive Flash graphics. From 2010 to 2016, Karl worked as an infographics specialist across all editorial properties of Purch (formerly known as TechMediaNetwork). Before joining Space.com, Karl spent 11 years at the New York headquarters of The Associated Press, creating news graphics for use around the world in newspapers and on the web. He has a degree in graphic design from Louisiana State University and now works as a freelance graphic designer in New York City.