There’s nothing like a good old fashioned science fight. When the discovery being challenged is one of the most public and intriguing of the last year, it’s bound to be even more interesting. A team of scientists, led by Andrew Lincowski and Victoria Meadows at the University of Washington (UW), and involving members from a variety of NASA labs and other universities, has challenged the discovery of phosphine in the atmosphere of Venus that was first announced last year. Their explanation is much simpler: it was most likely sulfur dioxide, one of the most abundant materials already known to be in Venus’ atmosphere.