Hubble Finds Structure in an Unstructured Galaxy

This NASA Hubble Space Telescope image features the nearby dwarf irregular galaxy Leo A, located some 2.6 million light-years away. The relatively open distribution of stars in this diminutive galaxy allows light from distant background galaxies to shine through.

Astronomers study dwarf galaxies like Leo A because they are numerous and may offer clues to how galaxies grow and evolve. Dwarf galaxies are small and dim making the most distant members of this galaxy type difficult to study. As a result, astronomers point their telescopes toward those that are relatively near to our own Milky Way galaxy, like Leo A. 

Leo A is one of the most isolated galaxies in our Local Group of galaxies. Its form appears as a roughly spherical, sparsely populated mass of stars with no obvious structural features like spiral arms. 

The data that created this image come from four Hubble observing programs. Three of these looked at star formation histories of relatively nearby dwarf galaxies. The fourth sought to better determine the mass of our Local Group by looking at the motions of dwarf galaxies just outside of the Local Group. 

The Hubble observations that looked at star formation found distinct structural differences in the age and distribution of stars in the galaxy. Most of the younger stars are located in the middle of the galaxy, while the number of older stars increases as you move outward from the center. Hubble observations also suggest that the galaxy’s halo of stars is about one-third larger than previous estimates. This distribution suggests that star formation in Leo A occurred from the outside-in, or that older stars efficiently migrated to the outskirts of Leo A in the early stages of its evolution.

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Media Contact:

Claire Andreoli
NASA’s Goddard Space Flight Center, Greenbelt, MD
claire.andreoli@nasa.gov

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Update on NASA Wallops Aircraft and Airfield Operations

The NASA Aircraft Management Advisory Board (AMAB), which manages the agency’s aircraft fleet, has decided to relocate the agency’s P-3 aircraft at Wallops to Langley Research Center. The decision is part of a long-running, NASA-wide aircraft enterprise-management activity to consolidate the aircraft fleet where feasible and achieve greater operational efficiencies while reducing our infrastructure footprint.

We all recognize this is a tough decision impacting a stellar, mission-focused team that has achieved so much over the years. I myself started my career in the Wallops Aircraft Office some 38 years ago, and my time there was foundational for all I’ve done in my career. My top priority is to work with the Aircraft Office team on a transition plan, and importantly, to carry out an effective and safe transition of the aircraft to NASA Langley, and to ensure the long term sustainability of NASA’s P-3 capability in support of the airborne science community. The Wallops aircraft office transition may take 18 to 24 months or more to accomplish. A specialized team is forming to ensure a smooth transition, and in the meantime, we continue to support airborne science from the facility.

With NASA’s flying mission at Wallops relocating to Langley, we recognize that the hangars and airfield at Wallops are true regional assets with great potential. NASA will issue a request for information (RFI) to identify potential customers/interest in assuming responsibility for Wallops’ airfield operations. It’s in the best interest of NASA and the region to explore other uses and opportunities for the Wallops airfield, and this RFI will help NASA evaluate future options. There is no timeline for the RFI at this time – we will provide updates as more information becomes available. What we do know – and are fully committed to – is ensuring the airfield remains an important resource for continued use by our customers, such as the U.S. Navy’s Fleet Force Command Field Carrier Landing Practice program. We’ve supported Navy flight operations at Wallops for more than 10 years and that support continues.

I want to assure everyone that Wallops’ future is bright and secure – the facility has a diverse mission set of orbital and suborbital operations and a whole host of government and commercial customers expanding operations on-site. We expect Wallops’ launch cadence to increase to upward of 50 launches per year by 2030 as the facility takes on a growing portfolio of hypersonics work as well as support to commercial spaceflight.

Without a doubt, the Wallops Aircraft Team is the best in the agency. They’ve had a massively successful run of operations recently with the ARCSIX missions in Greenland to supporting student research flights on both coasts and cargo transport missions all over the world to places such as Antarctica and India. I am committed to working with every member of the team on a way forward as we transition our flight operations and seek new opportunities.

We will continue to communicate with you and provide information on the transition plans as they become available.

All the best,

Dave

David L. Pierce
Wallops Director

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Rob Garner

Gateway: Energizing Exploration

Technicians work diligently to assemble a key power element of Gateway, the lunar space station that will become the most powerful solar electric spacecraft ever flown.

Gateway’s Power and Propulsion Element will use the largest roll-out solar arrays ever built – together about the size of an American football field endzone – to harness the Sun’s energy for deep space exploration. The module is built by Maxar Space Systems in Palo Alto, California, and managed at NASA’s Glenn Research Center in Cleveland. That includes energizing xenon gas to produce the thrust needed to send Gateway from Earth to lunar orbit and keep it there for the Artemis IV, V, and VI missions. On those missions and beyond, international teams of astronauts will expand Gateway with additional living and working space, and will journey to the lunar South Pole region from Gateway.

The Power and Propulsion Element will power Gateway’s subsystems and enable telecommunications between the lunar surface, the space station, Earth, and back again. Building on technology advancements from past successful electric propulsion missions like Psyche and DART (Double Asteroid Redirection Test), the module will help NASA expand the boundaries of what’s possible in deep space.

NASA and its international partners will explore the scientific mysteries of deep space with Gateway, humanity’s first space station around the Moon. The international teams of astronauts living and conducting science on Gateway will be the first humans to make their home in deep space.

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