In 2016, scientists at Goddard Space Flight Center produced mirrors with the highest reflectance ever reported in the farultraviolet spectral range. To develop these mirrors, the team developed a new three-step physical vapor deposition process to coat aluminum mirrors with protective magnesium fluoride or lithium fluoride films to protect the aluminum from naturally occurring oxidation and boost its reflectance performance in the FUV.
On Aug. 17, 2017, weak ripples in the fabric of space-time known as gravitational waves washed over Earth. Unlike previously detected gravitational waves, these were accompanied by light, allowing astronomers to pinpoint the source. NASA’s Hubble Space Telescope turned its powerful gaze onto the new beacon, obtaining both images and spectra. The resulting data will help reveal details of the titanic collision that created the gravitational waves, and its aftermath.
Atlanta is a bustling American metropolis of concrete and steel. It also boasts extensive parks, gardens, and urban forests. As with other growing metro areas, the city has been seeking ways to balance this green canopy and its vital infrastructure—especially as its population is expected to double by 2060.