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An artist's rendering of what a Class V planet might look like under this new planetary classification system. Michael Osadciw/Courtesy of University of Rochester hide caption

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Michael Osadciw/Courtesy of University of Rochester

New Mexico's largest electric provider — the coal-fired San Juan Generating Station near Farmington — has been defending a plan to replace part of an aging coal-fired power plant with a mix of more coal, natural gas, nuclear and solar power. Susan Montoya Bryan/AP hide caption

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Susan Montoya Bryan/AP

Climate Change Is Not Our Fault

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The moon is one of the most obvious natural indicators that the passing of time follows a pattern and can be tracked in a useful way. Bill McKelvie/ hide caption

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Bill McKelvie/