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By NASA
Credit: NASA NASA has awarded a contract to MacLean Engineering & Applied Technologies, LLC of Houston to provide simulation and advanced software services to the agency.
The Simulation and Advanced Software Services II (SASS II) contract includes services from Oct. 1, 2025, through Sept. 30, 2030, with a maximum potential value not to exceed $150 million. The contract is a single award, indefinite-delivery/indefinite-quality contract with the capability to issue cost-plus-fixed-fee task orders and firm-fixed-price task orders.
Under the five-year SASS II contract, the awardee is tasked to provide simulation and software services for space-based vehicle models and robotic manipulator systems; human biomechanical representations for analysis and development of countermeasures devices; guidance, navigation, and control of space-based vehicles for all flight phases; and space-based vehicle on-board computer systems simulations of flight software systems. Responsibilities also include astronomical object surface interaction simulation of space-based vehicles, graphics support for simulation visualization and engineering analysis, and ground-based and onboarding systems to support human-in-the-loop training.
Major subcontractors include Tietronix Software Inc. in Houston and VEDO Systems, LLC, in League City, Texas.
For information about NASA and agency programs, visit:
https://www.nasa.gov/
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Tiernan Doyle
Headquarters, Washington
202-358-1600
tiernan.doyle@nasa.gov
Chelsey Ballarte
Johnson Space Center, Houston
281-483-5111
Chelsey.n.ballarte@nasa.gov
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Last Updated Jul 02, 2025 LocationNASA Headquarters Related Terms
Technology Johnson Space Center View the full article
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By NASA
If you design a new tool for use on Earth, it is easy to test and practice using that tool in its intended environment. But what if that tool is destined for lunar orbit or will be used by astronauts on the surface of the Moon?
NASA’s Simulation and Graphics Branch can help with that. Based at Johnson Space Center in Houston, the branch’s high-fidelity, real-time graphical simulations support in-depth engineering analyses and crew training, ensuring the safety, efficiency, and success of complex space endeavors before execution. The team manages multiple facilities that provide these simulations, including the Prototype Immersive Technologies (PIT) Lab, Virtual Reality Training Lab, and the Systems Engineering Simulator (SES).
Lee Bingham is an aerospace engineer on the simulation and graphics team. His work includes developing simulations and visualizations for the NASA Exploration Systems Simulations team and providing technical guidance on simulation and graphics integration for branch-managed facilities. He also leads the branch’s human-in-the-loop Test Sim and Graphics Team, the Digital Lunar Exploration Sites Unreal Simulation Tool (DUST), and the Lunar Surface Mixed-Reality with the Active Response Gravity Offload System (ARGOS) projects.
Lee Bingham demonstrates a spacewalk simulator for the Gateway lunar space station during NASA’s Tech Day on Capitol Hill in Washington, D.C. Image courtesy of Lee Bingham Bingham is particularly proud of his contributions to DUST, which provides a 3D visualization of the Moon’s South Pole and received Johnson’s Exceptional Software of the Year Award in 2024. “It was designed for use as an early reference to enable candidate vendors to perform initial studies of the lunar terrain and lighting in support of the Strategy and Architecture Office, human landing system, and the Extravehicular Activity and Human Surface Mobility Program,” Bingham explained. DUST has supported several human-in-the-loop studies for NASA. It has also been shared with external collaborators and made available to the public through the NASA Software Catalog.
Bingham has kept busy during his nearly nine years at Johnson and said learning to manage and balance support for multiple projects and customers was very challenging at first. “I would say ‘yes’ to pretty much anything anyone asked me to do and would end up burning myself out by working extra-long hours to meet milestones and deliverables,” he said. “It has been important to maintain a good work-life balance and avoid overcommitting myself while meeting demanding expectations.”
Lee Bingham tests the Lunar Surface Mixed Reality and Active Response Gravity Offload System trainer at Johnson Space Center. Image courtesy of Lee Bingham Bingham has also learned the importance of teamwork and collaboration. “You can’t be an expert at everything or do everything yourself,” he said. “Develop your skills, practice them regularly, and master them over time but be willing to ask for help and advice. And be sure to recognize and acknowledge your coworkers and teammates when they go above and beyond or achieve something remarkable.”
Lee Bingham (left) demonstrates a lunar rover simulator for Apollo 16 Lunar Module Pilot Charlie Duke. Image courtesy of Lee Bingham He hopes that the Artemis Generation will be motivated to tackle difficult challenges and further NASA’s mission to benefit humanity. “Be sure to learn from those who came before you, but be bold and unafraid to innovate,” he advised.
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By European Space Agency
Video: 00:02:43 On 12 March 2025 ESA’s Hera spacecraft for planetary defence performs a flyby of Mars. The gravity of the red planet shifts the spacecraft’s trajectory towards the Didymos binary asteroid system, shortening its trip by months and saving substantial fuel.
This is a simulation of that flyby, sped up 500 times, with closest approach to Martian moon Deimos taking place at 12:07 GMT and Mars occurring at 12:51 GMT. It was made using SPICE (Spacecraft, Planet, Instrument, C-matrix, Events) software. Produced by a team at ESA’s ESAC European Space Astronomy Centre, this SPICE visualisation is used to plan instrument acquisitions during Hera’s flyby.
Hera comes to around 5000 km from the surface of Mars during its flyby. It will also image Deimos, the smaller of Mars’s two moons, from a minimum 1000 km away (while venturing as close as 300 km). Hera will also image Mars’s larger moon Phobos as it begins to move away from Mars. In this sped-up simulation, Deimos is seen 30 seconds in, at 12:07 GMT, while the more distant star-like Phobos becomes visible at two minutes in, at 12:49 GMT.
The spacecraft employs three of its instruments over the course of these close encounters, all located together on the ‘Asteroid Deck’ on top of Hera:
Hera’s Asteroid Framing Camera is formed of two redundant 1020x1020 pixel monochromatic visible light cameras, used for both navigation and science.
The Thermal Infrared Imager, supplied by the Japanese Aerospace Exploration Agency, JAXA, images at mid-infrared wavelengths to determine surface temperatures.
Hera’s Hyperscout H is a hyperspectral imager, observing in 25 visible and near-infrared spectral bands to prospect surface minerals.
Did you know this mission has its own AI? You can pose questions to our Hera Space Companion!
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By NASA
James Gentile always wanted to fly. As he prepared for an appointment to the U.S. Air Force Academy to become a pilot, life threw him an unexpected curve: a diagnosis of Type 1 diabetes. His appointment was rescinded.
With his dream grounded, Gentile had two choices—give up or chart a new course. He chose the latter, pivoting to aerospace engineering. If he could not be a pilot, he would design the flight simulations that trained those who could.
Official portrait of James Gentile. NASA/Robert Markowitz As a human space vehicle simulation architect at NASA’s Johnson Space Center in Houston, Gentile leads the Integrated Simulation team, which supports the Crew Compartment Office within the Simulation and Graphics Branch. He oversees high-fidelity graphical simulations that support both engineering analysis and flight crew training for the Artemis campaign.
His team provides critical insight into human landing system vendor designs, ensuring compliance with NASA’s standards. They also develop human-in-the-loop simulations to familiarize teams with the challenges of returning humans to the lunar surface, optimizing design and safety for future space missions.
“I take great pride in what I have helped to build, knowing that some of the simulations I developed have influenced decisions for the Artemis campaign,” Gentile said.
One of the projects he is most proud of is the Human Landing System CrewCo Lander Simulation, which helps engineers and astronauts tackle the complexities of lunar descent, ascent, and rendezvous. He worked his way up from a developer to managing and leading the project, transforming a basic lunar lander simulation into a critical tool for the Artemis campaign.
What began as a simple model in 2020 is now a key training asset used in multiple facilities at Johnson. The simulation evaluates guidance systems and provides hands-on piloting experience for lunar landers.
James Gentile in the Simulation Exploration and Analysis Lab during a visit with Apollo 16 Lunar Module Pilot Charlie Duke. From left to right: Katie Tooher, Charlie Duke, Steve Carothers, Mark Updegrove, and James Gentile. NASA/James Blair Before joining Johnson as a contractor in 2018, Gentile worked in the aviation industry developing flight simulations for pilot training. Transitioning to the space sector was challenging at first, particularly working alongside seasoned professionals who had been part of the space program for years.
“I believe my experience in the private sector has benefited my career,” he said. “I’ve been able to bring a different perspective and approach to problem-solving that has helped me advance at Johnson.”
Gentile attributes his success to never being afraid to speak up and ask questions. “You don’t always have to be the smartest person in the room to make an impact,” he said. “I’ve been able to show my value through my work and by continuously teaching myself new skills.”
As he helps train the Artemis Generation, Gentile hopes to pass on his passion for aerospace and simulation development, inspiring others to persevere through obstacles and embrace unexpected opportunities.
“The most important lessons I’ve learned in my career are to build and maintain relationships with your coworkers and not to be afraid to step out of your comfort zone,” he said.
James Gentile with his son at NASA’s Johnson Space Center during the 2024 Bring Youth to Work Day. His journey did not go as planned, but in the end, it led him exactly where he was meant to be—helping humanity take its next giant leap.
“I’ve learned that the path to your goals may not always be clear-cut, but you should never give up on your dreams,” Gentile said.
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By NASA
The Simulation and Graphics Branch produces several software tools to facilitate building and operating simulations. Many of these are available to download and are linked below.
Trick Simulation Environment The Trick Simulation Environment provides a common set of simulation capabilities that allow domain experts to concentrate on domain-specific models rather than simulation-specific functions like job ordering, input file processing, or data recording. Trick’s flexible feature set enables users to build applications for all phases of space vehicle development including early vehicle design and performance evaluation, flight software development and testing, flight vehicle dynamic loads analysis, and virtual and hardware-in-the-loop training.
General-Use Nodal Network Solver (GUNNS) The General-Use Nodal Network Solver (GUNNS) is a tool that combines nodal analysis and the hydraulic-electric analogy to simulate fluid, electrical, and thermal flow systems. It was developed to create medium-fidelity, real-time simulations for crew and flight controller training, and its ability to rapidly model complex integrated systems make it an ideal systems engineering tool: enabling detailed concept comparisons; facilitating requirement and design change impact assessments; and providing realistic environments for testing developmental flight software, high fidelity component and subsystem models, and prototype, developmental, and certification subsystem hardware. It includes core run-time models and code as well as graphical user interfaces for network design and run-time analysis.
TrickHLA The TrickHLA software supports the IEEE-1516 High Level Architecture (HLA) simulation interoperability standard for the Trick Simulation Environment. The TrickHLA software abstracts away the details of using HLA, allowing the user to concentrate on the simulation and not worry about having to be an HLA distributed simulation expert. The TrickHLA software is data driven and provides a simple Application Programming Interface (API) making it relatively easy to take an existing Trick simulation and make it a HLA distributed simulation.
TrickFMI A Functional Mockup Interface (FMI) Standard Implementation for Trick Base Models and Simulations. FMI standard was developed in partnership with governmental, academic and commercial entities in the European Union. This standard is used to support the exchange of component models for complex system simulations throughout Europe and the United States. Trick simulations are used all across NASA for simulations that support human spaceflight activities. However, until now, there were no means to use FMI based models in a Trick based simulation or a method for providing Trick based models that were FMI compliant. This software provides implementation software to do both.
TrickCFS TrickCFS is a software package that provides the C structs, C++ classes and pertinent code required to synchronize a core Flight Software (cFS) system with the Trick simulation executive. It also provides the capability to include cFS-based application (App) data structures for generating the Trick interface code required to peek and poke cFS App data.
Input Device Framework (IDF) IDF is a software library that provides an infrastructure for interfacing software with physical input devices. Examples of common devices include hand controllers, joysticks, foot pedals, computer mice, game controllers, etc. Conceptually, the framework can be extended to support any device that produces digital output. IDF additionally presents, and is itself an implementation of, a design methodology that encourages application developers to program against domain-specific interfaces rather than particular hardware devices. This abstraction frees the application from the details of communicating with the underlying devices, resulting in robust and flexible code that is device-agnostic. IDF ensures that devices meet application interface requirements, supports many-to-many relationships between application interfaces and devices, allows for flexible and dynamic interpretation of device inputs, and provides methods for transforming and combining inputs.
Displays and Controls Software (DCApp) Dcapp (pronounced “dee see app”) is a displays and controls software package designed for UNIX platforms, specifically MacOS and Linux.
It is built upon standard UNIX technologies like OpenGL for graphics, libxml2 for input file parsing, and FreeType2 for font handling. For window management and event handling, it uses Cocoa on MacOS machines and X11 for Linux-based machines. It has built-in communication libraries to communicate with external Trick-based simulations and EDGE/DOUG graphics.
Data Visualization Tool – Koviz Koviz is a simulation data visualization tool. It is designed especially for Trick monte carlo data analysis, comparing simulation runs, analyzing data spikes and creating report quality plot booklets. Koviz can be run interactively via the GUI or can be run in batch. Koviz supports Trick binary data and CSV. Koviz offers a real-time analysis report for Trick real-time data recordings. Koviz also offers a plugin-like functionality, external programs, to transform simulation data. Koviz can also be synced with video so one can view video alongside associated data.
JSC Engineering Orbital Dynamics (JEOD) The JSC Engineering Orbital Dynamics (JEOD) Software Package is a simulation tool designed to work with NASA Trick Simulation Environment that provides vehicle trajectory generation by the solution of a set of numerical dynamical models. These models are subdivided into four categories. There are Environment models representing the conditions surrounding the vehicle, Dynamics models for integrating the equations of motion, Interaction models representing vehicle interactions with the environment, and a set of mathematical and orbital dynamics Utility models.
JEOD is designed to simulate spacecraft trajectories in flight regimes ranging from low Earth orbit to lunar operations, interplanetary trajectories, and other deep space missions. JEOD can be used to simulate a stand-alone spacecraft trajectory and attitude state, or it can be interfaced with a larger simulation space, such as coupling with spacecraft effectors and guidance, navigation and control systems. More than one spacecraft can be simulated about one central body or separate spacecraft about separate central bodies.
Other Simulation and Graphics Products View the full article
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