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Dendritic fibrous nanosilica (DFNS), also known as KCC-1, has a unique fibrous morphology and a high surface area with improved accessibility to the internal surface, tunable pore size and volume, controllable particle size, which made it useful in the fields of energy, environment, and health. Credit: Ayan Maity, Vivek Polshettiwar

The comet entered the bottom of STEREO’s view and crossed it diagonally before leaving on Oct. 28. Most of the corona has been suppressed in order to bring out the comet, leaving only the dynamic flow of the solar wind. Credit: NASA’s Goddard Space Flight Center/STEREO/Bill Thompson/Joy Ng

A selection of the 23 cameras on NASA’s 2020 Mars rover. Many are improved versions of the cameras on the Curiosity rover, with a few new additions as well. Image Credit: NASA/JPL-Caltech UPDATED AT 4:15 p.m. PDT to correct the number of EDL cameras shown in the image. Credit: NASA/JPL-Caltech

Asteroid Trails Streak Across This Deep-Space View of Thousands of Galaxies. Photobombing asteroids from our solar system have snuck their way into this deep image of the universe taken by NASA’s Hubble Space Telescope. These asteroids are right around the corner in astronomical terms, residing roughly 160 million miles from Earth. Yet they’ve horned their way into this picture of thousands of galaxies scattered across space and time at inconceivably farther distances. Credit: NASA, ESA, and B. Sunnquist and J. Mack (STScI) Acknowledgment: NASA, ESA, and J. Lotz (STScI) and the HFF Team