The surface of Mars is littered with examples of glacier-like landforms. While surface ice deposits are mostly limited to the polar caps, patterns of slow, viscous flow abound in many non-polar regions of Mars. Streamlines that appear as linear ridges in the surface soils and rocky debris are often exposed on top of infilling deposits that coat crater and valley floors. We see such patterns on the surfaces of Earth's icy glaciers and debris-covered "rock glaciers." As ice flows downhill, rock and soil are plucked from the surrounding landscape and ferried along the flowing ice surface and within the icy subsurface. While this process is gradual, taking perhaps thousands of years or longer, it creates a network of linear patterns that reveal the history of ice flow.

Image Credit: NASA / JPL-Caltech / University of Arizona

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Orville Wright makes the first powered, controlled flight on Earth as his brother Wilbur looks on in this image taken at Kitty Hawk, North Carolina, on Dec. 17, 1903. Orville Wright covered 120 feet in 12 seconds during the first flight. The Wright brothers made four flights that day, each longer than the last.

Image Credit: Library of Congress

"Once the rocket launched, [I saw] how it illuminated such a dark space. So even when you're in a dark space, you can let your light shine. And it won't just shine for you and those that are immediately around you, but even people that you don't know will notice it, even people that you will never see will notice your light shining and be inspired.” — Ales-Cia Winsley, Lead Space Launch System Avionics Engineer, NASA’s Kennedy Space Center

Image Credit: NASA / Cory S Huston

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Artemis II crew members, shown inside the Neil Armstrong Operations and Checkout Building at NASA’s Kennedy Space Center in Florida, stand in front of their Orion crew module on Aug. 8, 2023. From left are: Jeremy Hansen, mission specialist; Victor Glover, pilot; Reid Wiseman, commander; and Christina Hammock Koch, mission specialist. The crew module is undergoing acoustic testing ahead of integration with the European Service Module. Artemis II is the first crewed mission on NASA’s path to establishing a long-term lunar presence for science and exploration under Artemis.

Image Credit: NASA / Kim Shiflett

This striking image shows the densely packed globular cluster known as NGC 2210, which is situated in the Large Magellanic Cloud (LMC). The LMC lies about 157 000 light-years from Earth, and is a so-called satellite galaxy of the Milky Way, meaning that the two galaxies are gravitationally bound. Globular clusters are very stable, tightly bound clusters of thousands or even millions of stars. Their stability means that they can last a long time, and therefore globular clusters are often studied in order to investigate potentially very old stellar populations.

Image Credit: ESA/Hubble & NASA, A. Sarajedini

Artemis II NASA astronauts Reid Wiseman (left) and Christina Koch (middle) of NASA and CSA (Canadian Space Agency) astronaut Jeremy Hansen (second from left) view the core stage for the Space Launch System rocket at the agency’s Michoud Assembly Facility in New Orleans on Nov. 16. The three astronauts, along with NASA’s Victor Glover, will launch atop the rocket stage to venture around the Moon on Artemis II, the first crewed flight for Artemis.

Image Credit: NASA / Michael DeMocker

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The mated Russian-built Zarya (left) and U.S.-built Unity modules are backdropped against the blackness of space and Earth's horizon shortly after leaving Endeavour's cargo bay. The photo was taken with an electronic still camera at 21:20:21 GMT, Dec. 13.

Image Credit: NASA

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The Moon, left, Saturn, upper right, and Jupiter, lower right, are seen after sunset from Washington, DC, Thurs. Dec. 17, 2020. The two planets drew closer to each other in the sky as they headed towards a “great conjunction” on Dec. 21, where the two giant planets appeared a tenth of a degree apart.

Image Credit: NASA/Aubrey Gemignani

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If spacecraft are to visit the outer Solar System, they must cross the asteroid belt between Mars and Jupiter. The Pioneer mission was faced with the question of just how dangerous this asteroid belt would be to a spacecraft passing through it.

Image Credit: NASA