An artist's concept depicts one possible appearance of the planet Kepler-452b, the first near-Earth-size world to be found in the habitable zone of a star that is similar to our sun.
NASA Ames/JPL-Caltech/T. Pyle
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
A stellar nursery consisting of a group of thick clouds of dust, known as the Thackeray globules, silhouetted against the pale pink glowing gas of the nebula, as captured by the European Southern Observatory's Very Large Telescope.