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A Cosmic Pretzel.

NASA Selects 25 Promising Space Technologies for Commercial Flight Tests

A simulation of early galaxy formation under three dark matter scenarios. In a universe filled with cold dark matter, early galaxies would first form in bright halos (far left). If dark matter is instead warm, galaxies would form first in long, tail-like filaments (center). Fuzzy dark matter would produce similar filaments, though striated (far right), like the strings of a harp.

NASA and Uber Test System for Future Urban Air Transport

In this image captured by NASA's Cassini spacecraft in 2007, the plumes of Enceladus are clearly visible. The moon is nearly in front of the Sun from Cassini's viewpoint.

Blue-white B-star.

The spectrum of interstellar comet 2I/Borisov obtained using ISIS spectrograph on the WHT on the 20th of September, showing how the amount of light coming from the comet depends on the wavelength of light. The light emitted by cyanogen gas molecules is clearly identified, above all the light being reflected from the dust grains also emitted by the comet.

This cloud of gas and dust is full of bubbles, which are inflated by wind and radiation from massive young stars. Yellow circles and ovals show the locations of more than 30 bubbles. Squares indicate bow shocks, red arcs of warm dust formed as winds from fast-moving stars push aside dust grains.

A screenshot of the Light Pollution Simulator: the default screen.

The most distant protocluster discovered by the Subaru Telescope. The blue shading shows the calculated extent of the protocluster, and the bluer color indicates higher density of galaxies in the protocluster. The red objects in zoom-in figures are the 12 galaxies found in it. This figure shows a square field-of-view 24 arcminutes along each side (corresponding to 198 million light-years along each side at a distance of 13.0 billion light-years). Each zoom-in figure is 16 arcseconds along each side (corresponding to 2.2 million light-years).