X-ray: NASA/CXC/Univ. of Chicago/H. McCall Galaxy clusters are the most massive objects in the universe held together by gravity, containing up to several thousand individual galaxies and huge reservoirs of superheated, X-ray-emitting gas. The mass of this hot gas is typically about five times higher than the total mass of all the galaxies in galaxy [...]

Nicolas Escurat A flash of lightning, and then—something else. High above a storm, a crimson figure blinks in and out of existence. If you see it, you are a lucky witness of a sprite, one of the least-understood electrical phenomena in Earth’s upper atmosphere. Sprites occur at some 50 miles (80 kilometers) altitude, high above [...]

A pilot signals to a crew member before takeoff from NASA’s Armstrong Flight Research Center in Edwards, California, on Aug. 21, 2025. Accompanying him in the high-flying ER-2 aircraft is one of the most advanced imaging spectrometers in the solar system.NASA/Christopher LC Clark Called AVIRIS-5, it’s the latest in a long line of sensors pioneered [...]

This composite image of the Cassiopeia A (or Cas A) supernova remnant, released Jan. 8, 2024, contains X-rays from Chandra (blue), infrared data from Webb (red, green, blue), and optical data from Hubble (red and white). A study by the XRISM (X-ray Imaging and Spectroscopy Mission) spacecraft has made the first-ever X-ray detections of chlorine [...]

3 min read Preparations for Next Moonwalk Simulations Underway (and Underwater) NASA’s broadcast of the April 8, 2024, total solar eclipse has won an Emmy Award for Excellence in Production Technology. At the 76th Technology & Engineering Emmy Awards on Dec. 4, in New York City, the Academy of Television Arts & Sciences announced the [...]

NASA/JPL-Caltech Researchers from NASA’s Jet Propulsion Laboratory monitor a research drone in this September 2025 photo. This flight occurred in Dumont Dunes, an area of the Mojave Desert, as part of a larger test campaign to develop navigation software that would guide future rotorcraft on Mars. The work was among 25 projects funded by NASA’s [...]

Over the course of several hours, technicians meticulously connected the inner and outer segments of NASA’s Nancy Grace Roman Space Telescope.NASA/Jolearra Tshiteya Two technicians look up at NASA’s Nancy Grace Roman Space Telescope after its inner and outer segments were connected at the agency’s Goddard Space Flight Center in Greenbelt, Maryland on Nov. 25, 2025. [...]

The Soyuz MS-26 spacecraft is seen as it lands on April 20, 2025 (April 19 Eastern time) in a remote area near the town of Zhezkazgan, Kazakhstan, with the Expedition 71/72 crew aboard. NASA/Bill Ingalls NASA astronaut Jonny Kim, accompanied by Roscosmos cosmonauts Sergey Ryzhikov and Alexey Zubritsky, is preparing to depart the International Space [...]

Select walls at NASA’s Johnson Space Center have been transformed into works of art. Each piece reflects creativity, collaboration, and the spirit of discovery. Painted by Texas students, the murals honor the legacy of the International Space Station and 25 years of continuous human presence in space.  The International Space Station Program Mural Project began [...]

To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Three Martian dust devils can be seen near the rim of Jezero Crater in this short video made of images taken by a navigation camera aboard NASA’s Perseverance rover on Sept. 6, 2025. The microphone on the [...]