All my favorite colors, right on. Red, green, and blue aren’t the colors we usually associate with the Sun. In this composite picture, though, these hues unveil a secret: hidden light from the Sun. This new view of solar light comes from our Nuclear Spectroscopic Telescope Array (NuSTAR), our Solar Dynamics Observatory (SDO), and the Japan Aerospace Exploration Agency’s (JAXA) Hinode mission, with each type of data represented in a different color: blue for NuSTAR’s high-energy X-rays, red for SDO’s ultraviolet light, and green for Hinode’s lower energy X-rays. Images like this could help us understand why the Sun’s outer atmosphere—the corona—is at least 100 times hotter than its surface. This phenomenon has puzzled scientists because the Sun’s heat originates in its core and travels outward, but’s observations could tell us more. One potential source of the corona’s heat could be small eruptions in the Sun’s atmosphere called nanoflares. Nanoflares are outbursts of heat, light, a...