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Fluorescence microscopy image of marine microbial life stained with a DNA-binding dye. The smallest dots are virus-like particles, which can reach concentrations of 1 to 100 million per milliliter of

(a) The Earth’s extensive and H-rich exosphere scatters solar Lyman-α photons, producing the geocoronal airglow; (b) the geometry of Earth’s illumination by the Sun (adapted from Kameda et al. 2017).

The peak temperature achieved by all tracer particles in simulations of a 1 km diameter comet impacting at 10 km s−1 (left) and 40 km s−1 (right) in a provenance

This view of tracks trailing NASA’s Curiosity was captured July 26, 2025, as the rover simultaneously relayed data to a Mars orbiter. Combining tasks like this more efficiently uses energy