A cluster brimming with millions of stars glistens like an iridescent opal in this image from NASA's Spitzer Space Telescope. Called Omega Centauri, the sparkling orb of stars is like a miniature galaxy. It is the biggest and brightest of the 150 or so similar objects, called globular clusters, that orbit around the outside of our Milky Way galaxy. Stargazers at southern latitudes can spot the stellar gem with the naked eye in the constellation Centaurus. Globular clusters are some of the oldest objects in our universe. Their stars are over 12 billion years old, and, in most cases, formed all at once when the universe was just a toddler. Omega Centauri is unusual in that its stars are of different ages and possess varying levels of metals, or elements heavier than boron. Astronomers say this points to a different origin for Omega Centauri than other globular clusters: they think it might be the core of a dwarf galaxy that was ripped apart and absorbed by our Milky Way long ago. In this new view of Omega Centauri, Spitzer's infrared observations have been combined with visible-light data from the National Science Foundation's Blanco 4-meter telescope at Cerro Tololo Inter-American Observatory in Chile. Visible-light data with a wavelength of .55 microns is colored blue, 3.6-micron infrared light captured by Spitzer's infrared array camera is colored green and 24-micron infrared light taken by Spitzer's multiband imaging photometer is colored red. Where green and red overlap, the color yellow appears. Thus, the yellow and red dots are stars revealed by Spitzer. These stars, called red giants, are more evolved, larger and dustier. The stars that appear blue were spotted in both visible and 3.6-micron-, or near-, infrared light. They are less evolved, like our own sun. Some of the red spots in the picture are distant galaxies beyond our own. (https://www.nasa.gov/wp-content/uploads/2023/11/spiders.jpg)

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. (https://www.nasa.gov/wp-content/uploads/2023/12/arc-1974-ac73-9344orig.jpg)

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. (https://www.nasa.gov/wp-content/uploads/2023/12/nhq202012170001orig.jpg)

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. (https://www.nasa.gov/wp-content/uploads/2023/12/s88e5157orig.jpg)

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. (https://www.nasa.gov/wp-content/uploads/2023/12/maf-20231116-cs2-astronautvisit02orig.jpg)

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. (https://www.nasa.gov/wp-content/uploads/2023/12/cluster-in-the-cloud.jpg)

Astronaut Kathryn C. Thornton works with equipment associated with servicing chores on the Hubble Space Telescope during the fourth spacewalk on the eleven-day mission. (https://www.nasa.gov/wp-content/uploads/2023/12/sts061-098-0korig.jpg)

NASA’s James Webb Space Telescope’s new view of Cassiopeia A (Cas A) in near-infrared light is giving astronomers hints at the dynamical processes occurring within the supernova remnant. Tiny clumps represented in bright pink and orange make up the supernova’s inner shell, and are comprised of sulfur, oxygen, argon, and neon from the star itself. A large, striated blob at the bottom right corner of the image, nicknamed Baby Cas A, is one of the few light echoes visible NIRCam’s field of view. In this image, red, green, and blue were assigned to Webb’s NIRCam data at 4.4, 3.56, and 1.62 microns (F444W, F356W, and F162M, respectively). (https://www.nasa.gov/wp-content/uploads/2023/12/53389652123-d38edbe3d7-o.png)

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. (https://www.nasa.gov/wp-content/uploads/2023/12/ksc-20230808-ph-kls02-0098orig.jpg)

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. (https://www.nasa.gov/wp-content/uploads/2023/12/pia24434orig.jpg)

This composite image shows the Christmas Tree Cluster. The blue and white lights (which blink in the animated version of this image) are young stars that give off X-rays detected by NASA’s Chandra X-ray Observatory. Optical data from the National Science Foundation’s WIYN 0.9-meter telescope on Kitt Peak shows gas in the nebula in green, corresponding to the “pine needles” of the tree, and infrared data from the Two Micron All Sky Survey shows foreground and background stars in white. This image has been rotated clockwise by about 160 degrees from the astronomer’s standard of North pointing upward, so that it appears like the top of the tree is toward the top of the image. (https://www.nasa.gov/wp-content/uploads/2023/12/ngc2264.jpg)

At the start of October 2023, green conifers and golden aspen covered the slopes of Monroe Mountain in Utah’s Fishlake National Forest. Then, starting on October 9, these forests turned black as fire worked its way across the mountain. Flames and smoke were visible for miles. (https://www.nasa.gov/wp-content/uploads/2023/12/firesensefire-pho-2023282-lrg.jpg)

Artemis II crew members: CSA (Canadian Space Agency) astronaut Jeremy Hansen, left, NASA astronauts Christina Koch, Victor Glover, and Reid Wiseman, right, pose for a group photograph after their meetings with U.S. President Joe Biden and U.S. Vice President Kamala Harris at the White House in Washington, Thursday, Dec. 14, 2023. During their mission, the Artemis II crew will travel aboard NASA's Orion spacecraft on a 10-day mission around the Moon, testing spacecraft systems for the first time with astronauts for long-term exploration and scientific discovery. (https://www.nasa.gov/wp-content/uploads/2023/12/nhq202312140006orig.jpg)

Four reindeer walk past the BARREL payload on the launch pad at Esrange Space Center near Kiruna, Sweden. The BARREL team was at Esrange Space Center launching a series of six scientific payloads on miniature scientific balloons. The NASA-funded BARREL – which stands for Balloon Array for Radiation-belt Relativistic Electron Losses – primarily measured X-rays in Earth’s atmosphere near the North and South Poles. (https://www.nasa.gov/wp-content/uploads/2023/12/gsfc-20171208-archive-e000249orig.jpg)

Seen here by Webb, ice giant Uranus is a dynamic world with rings, moons, storms, extreme seasons, and more. Webb’s sensitivity has even captured the close-in Zeta ring, faint, diffuse, and elusive.

These new images reveal detailed features of Uranus’s seasonal north polar cap, as well as bright storms near and below the southern border of the cap. If humans want to send a spacecraft to visit Uranus up close, it’s necessary to understand how to navigate debris from its rings. (https://www.nasa.gov/wp-content/uploads/2023/12/53404881117-64e0071ca0-o.png)

Creating an artistic reflection, a Great Blue Heron skims its wings on a waterway at NASA's Kennedy Space Center in Florida on Jan. 11, 2021. The center shares a border with the Merritt Island National Wildlife Refuge. (https://www.nasa.gov/wp-content/uploads/2023/12/ksc-20210111-ph-jbs01-0072orig.jpg)

Resembling sparks from a fireworks display, this image taken by a JPL camera onboard NASA's Hubble Space Telescope shows delicate filaments that are sheets of debris from a stellar explosion in the nearby Large Magellanic Cloud galaxy. (https://www.nasa.gov/wp-content/uploads/2023/12/pia04609orig.jpg)

Jupiter, top, and Venus, bottom, are seen with the crescent Moon above the Vehicle Assembly Building, Wednesday, Feb. 22, 2023, at NASA’s Kennedy Space Center in Florida as preparations continued for NASA’s SpaceX Crew-6 mission. The agency’s SpaceX Crew-6 mission was the sixth crew rotation mission of the SpaceX Dragon spacecraft and Falcon 9 rocket to the International Space Station as part of the agency’s Commercial Crew Program. (https://www.nasa.gov/wp-content/uploads/2024/01/52704988217-a8442a095c-o.jpg)

NASA astronauts Kjell Lindgren, Jessica Watkins, and Robert Hines participate in STEM demonstrations with local students at the Martin Luther King Jr Memorial Library, Thursday, March 30, 2023, in Washington. Lindgren, Hines, and Watkins spent 170 days in space as part of Expeditions 67 and 68 aboard the International Space Station. (https://www.nasa.gov/wp-content/uploads/2024/01/52782508755-c3a998cde9-o.jpg)

Expedition 70 NASA astronaut Loral O'Hara has her Russian Sokol spacesuit pressure checked ahead launching to the International Space Station with fellow crewmates, Roscosmos cosmonauts Oleg Kononenko and Nikolai Chub, Friday, Sept. 15, 2023 in Baikonur, Kazakhstan. (https://www.nasa.gov/wp-content/uploads/2024/01/53193285376-f2483c928f-o.jpg)