NASA Space Apps 2026 · Team Void Voyagers

Stay well
beyond Earth.

A one-minute health check for astronauts. One reading, one verdict, one next step. Works with no signal.

Launch console Read the guide

Astronauts

A private self-check, far from a doctor

Crew medical officers

Consistent readings, trends and next steps

Flight surgeons

Clear reports the crew has read first

Analogue crews

Polar, desert and isolation studies

Students

Learn how bodies change in space

Radio delay from Mars22 mineach way, at its longest

Self-checks15each with a verdict and a next step

Library entries11961 conditions and 58 medicines, all sourced

Cookies and trackers0health data stays on the device

01 · The problem and our solution

When something feels wrong far from Earth, the crew can’t wait for a doctor. Void Voyagers turns one reading into one verdict and one next step, with no signal needed.

A check takesAbout 1 minute

The verdictNominal to Urgent

Needs a connectionNever

Who we are

02 · Team Void Voyagers

Five people from Mongolia, building for the NASA Space Apps Challenge 2026. Built on NASA data and astronaut studies, with Claude (Anthropic) as research and coding assistant; the team reviewed the medical content. Open source under the MIT license.

Lead developer
Temuulen Buuveibaatar
High school student. Leads the whole architecture and how every part of the app works.
Co-developer · front end · research · testing
Ulugbek Yuldashov
Teacher at Orkhon Empathy school. Builds the front end, researches the science and tests the app.
Co-developer · testing
Orkhon Munkh-Oron
High school student. Rigorous site testing and support for team leadership, for a reliable final submission.
Researcher
Erdenebaatar Ankhzaya
High school student. In-depth research: gathers and analyses data and turns it into insights the team can build on.
Designer
Bat-Erdene Munkhkhuslen
High school student. Visual design and user-friendly interfaces, plus creative ideas for the experience and the presentation.

Code on GitHub Research documentation Privacy charter

Built onNASA Human Research ProgramNASA-STD-3001NASA DONKI space weatherNASA HLS imageryJPL orbital dataCSAESA

How to use it

03 · 4 steps

Pick your mission
Station, Moon, Mars transit or Mars base, at the top.
Do today’s checks
Each has step-by-step instructions on Today.
Read the verdict
Nominal, Watch, Act or Urgent, plus the next step.
Look it up or report
Library for answers; send the flight surgeon a report you’ve read first.

The console starts with a made-up 42-day mission. Press “Start my own log” there to use your own. After the first visit everything works offline, and you can install it as an app from the browser menu.

Today

Daily health check

Mission link

Positions from JPL’s “Approximate Positions of the Planets” (Standish) and the main lunar terms in Meeus, Astronomical Algorithms, checked against NASA JPL Horizons for 2026–2030: Mars within 0.02%, the Moon within 110 km. Signals travel at the speed of light; relays and ground stations add a little.

Body systems

Tap a body part or choose a system from the list.

Today’s checks

Badges

Findings & what to do

You see exactly what is sent before it goes.

All indicators

Tap to log a reading

Crew profile & data

Used for your personal targets. Stays on this device.

Pre-flight body mass (kg) Sex (sets the fluid minimum)

Mission start date Mission length (days)

Bone medication plan (set by your flight surgeon)

Your data

Readings are saved in this browser only. Download a backup regularly: clearing browser data deletes them.

How it works

Guide

Plain-language help for checking yourself in space. No medical training assumed.

Four colours, four actions

Nominal

Inside the healthy range for you and this mission. Keep your routine.

Watch

A little outside your normal. Look after yourself, re-check, and mention it at your next private medical conference.

Act

Needs attention today. Follow the steps shown and tell your crew medical officer.

Urgent

Possible emergency. Alert your crewmates, start the onboard emergency procedure and contact the flight surgeon on the priority channel.

Every status has a shape and a word as well as a colour, so it reads the same on any screen, in any light, and with colour-blindness.

When to call for help

Look after yourself
Sleep, eat your full ration, drink to your target and do your exercise. Most problems in space start small.
Re-check, then mention it
Repeat the measurement the right way (see How to measure). If it stays outside your normal, raise it at your weekly private medical conference with the flight surgeon.
Tell your crew medical officer today
On the ISS each crew has two crew medical officers (CMOs). They are usually not doctors, but they are trained to examine you, use the onboard medical kit and bring in the flight surgeon.
Emergency: act now
Alert your crewmates and start the onboard procedure first. Near Earth the flight surgeon is on call 24 hours a day. From Mars a message takes 3–22 minutes each way and there is no early ride home, so the crew must act before help can answer.

Why check yourself in space?

Your body changes quickly. In weightlessness about 2 litres of fluid shift towards your head, blood plasma falls by roughly 10–15%, weight-bearing bone lost 1–1.5% a month even with the exercise devices of Mir and the early ISS (about 0.5–1% with today’s), and most crew sleep only about 6 hours a night. Catching a change early turns a mission-ending problem into a small fix.

Help is far away. From the space station, Earth is about a day away. From the Moon it is several days; from Mars there is no early return at all. The further you go, the more your crew has to notice, judge and treat on its own. That is what Void Voyagers is for.

What you can measure yourself: heart rate, blood pressure, oxygen saturation, temperature, a finger-stick glucose, sleep, mood, a 3-minute reaction test, near vision and the Amsler grid, fluids, exercise and body mass, plus cabin CO₂ and your radiation dosimeter. Bone density, eye scans and blood chemistry need specialist equipment and the medical team.

How Void Voyagers decides. Each reading is compared with clinical early-warning ranges (NEWS2, AHA/ACC 2025, ADA 2026, sleep-medicine consensus) and NASA limits. Where no fixed number exists, it compares the reading with your own baseline. Rules that are Void Voyagers design choices, such as the reaction-test band, are marked in How to measure.

The five hazards of spaceflight

NASA groups the dangers of spaceflight into five hazards. Each one shows up in the measurements you take.

Why bones weaken in space, and what helps

What happens

Without gravity your bones carry no load. Cells that remove bone speed up while bone-building cells lag. Hip and spine lose about 1–1.5% a month, roughly what an older adult loses in a year.

Load it heavy

Heavy resistance exercise (squats, deadlifts and heel raises at 100% of body weight or more) plus treadmill running protects most sites. ISS crews exercise about 2 hours a day, 6 days a week.

Fuel it

Eat your full ration with enough protein and vitamin D, and keep sodium at 2,300 mg a day or less (NASA’s exploration requirement is 1,500–2,300 mg). Weight loss and salty food both speed up bone loss.

Protect your kidneys

Calcium from bone ends up in urine and can form stones. Drink to your fluid target. Flank pain with blood in urine means contacting the flight surgeon now.

Medication

Exercise alone does not stop loss of the hip’s spongy inner bone. In an ISS study, exercise plus weekly alendronate attenuated loss at the spine, hip and pelvis, and NASA experts have suggested a pre-flight zoledronic acid infusion for missions of a year or more. Only the flight surgeon can prescribe them.

After landing

Recovery is slow and often incomplete: 9 of 17 astronauts had not regained shin density a year after landing. Keep loading, follow the walking-to-jogging plan and attend your follow-up scans.

The bone estimate (Today → Bones & muscles) comes from the team’s Orbit Health bone module. Sources: NASA HRP bone fracture evidence report (2024); LeBlanc 2013; Smith 2012; Sibonga 2019; Vico 2017; Gabel 2022; Stavnichuk 2020; Lane 2013.

Mission environments

The ISS rate is effective dose. The Moon, transit and Mars rates are dose equivalent measured behind light shielding (China’s Chang’e-4 lander and NASA’s Curiosity rover), so they run high for a shielded habitat; NASA’s design ceilings are 1.3 mSv/day in free space and 0.9 on a surface. Your dosimeter shows absorbed dose in mGy, so the app compares it with absorbed-dose baselines, never with the mSv figures.

How to measure

Step-by-step instructions for each check, how often to do it, and where Void Voyagers’s ranges come from.

From ESA’s Space Heritage archive

1981 · ESTEC-PHOTO-1981.10.157

Sled training for Spacelab-1

ESA astronauts Ulf Merbold and Wubbo Ockels trained on the sled used to study balance and space sickness in weightlessness. About 70% of crew still feel space-sick for the first 2–3 days.

1984 · ESTEC-PHOTO-1984.12.009

Astronaut sleep restraint

A sleep restraint designed and demonstrated by ESA astronaut Wubbo Ockels. Sleeping well in space is still hard: crews average about 6 hours a night.

1984 · ESA BR-17

A Survey of Space Biology and Space Medicine

ESA’s early overview of how weightlessness affects the heart, balance organs and skeleton: the same systems Void Voyagers tracks today.

Sources

NASA Human Research Program: the five hazards, human system risks, ongoing research
NASA-STD-3001 Volume 1 Rev C: career radiation limit 600 mSv, strength at least 80% of baseline (PDF)
NASA OCHMO technical briefs: carbon dioxide (TB-004), radiation protection (TB-020), SANS (MTB-001)
NASA exploration nutrition requirements JSC-67378: fluids 32 mL per kg (PDF)
Canadian Space Agency: Monitoring radiation for astronaut health (2026) and Why do we conduct science experiments in space?
Royal College of Physicians NEWS2 early-warning score; AHA/ACC 2025 blood-pressure guideline; ADA Standards of Care 2026, sections 2 and 6 (doi)
Sleep: Watson et al. 2015, AASM/SRS (doi); Barger et al. 2014, astronaut sleep (doi); Jones et al. 2022, ISS Reaction Self-Test (doi)
Reaction and wellbeing: Basner et al. 2011, PVT-B (doi); Kroenke et al. 2009, PHQ-4 (doi)
Physiology: Norsk et al. 2015, blood pressure on the ISS (doi); Stahn et al. 2017, core temperature in flight (doi); Law et al. 2014, CO₂ and headaches (doi)
Bone: NASA HRP bone fracture evidence report (2024); LeBlanc et al. 2013 (alendronate plus exercise); Sibonga et al. 2019; Smith et al. 2012; Stavnichuk et al. 2020 (regional loss meta-analysis); Gabel et al. 2022 and Vico et al. 2017 (recovery); Lane et al. 2013 (ISS sodium)
Live NASA data: space weather from NASA DONKI via api.nasa.gov; Earth views from NASA Harmonized Landsat and Sentinel-2 (HLS), served by the Microsoft Planetary Computer STAC and data APIs
3D body: anatomy from BodyParts3D, © The Database Center for Life Science, licensed under CC Attribution-Share Alike 2.1 Japan (simplified meshes; the lungs are modelled around its bronchial tree; the female body is adapted from the same male data set with average female proportions). Drawn with three.js (MIT).
Radiation: Shavers et al. 2024, ISS (doi); Zhang et al. 2020, lunar surface (doi); Zeitlin et al. 2013, cruise to Mars (doi); Hassler et al. 2014, Mars surface (doi)

Void Voyagers is a training and research prototype built by team Void Voyagers for the NASA Space Apps Challenge 2026. It is not a medical device and does not replace your crew medical officer, flight surgeon or doctor.

Last updated 15 November 2026

Privacy charter

Our six commitments to every crew member:

Your health data stays on this device unless you choose to send a report.
Nothing leaves without your tap. Apart from loading the page itself, only three buttons send anything, and each says what it sends.
No accounts, cookies, analytics, advertising or trackers.
You see every report before it is sent. Only the team can read the inbox, and every report is deleted automatically after 90 days.
You can download or delete everything at any time in Crew profile & data.
Open and auditable. The full source code is public on GitHub under the MIT license.

Who is responsible

Team Void Voyagers, the NASA Space Apps Challenge 2026 team that built this app, is responsible for the report inbox (the “data controller”). To ask about your data or have a report deleted, write to us privately through the private report form on our GitHub page, with the time you sent the report and your callsign. Nobody else can see that message.

What Void Voyagers stores, and where

Your readings, crew profile (pre-flight mass, sex for the fluid target, mission dates, bone medication plan), the symptoms you tick, emergency and storm-shelter logs, your medicine-kit list, reports waiting to be sent, and settings (including the place you chose for Window to Earth and your body-map view) are saved in this browser’s local storage under the keys voidvoyagers.v1 and voidvoyagers.theme. They never leave the device unless you send a report.
To work without a connection, Void Voyagers keeps a copy of the app itself (its page, fonts and 3D model, never your data) in the browser’s cache.
Anyone who uses this browser on this device can open Void Voyagers and see your readings. On a shared device, delete your data when you finish.
Backups you download are ordinary files you keep. They are not encrypted, so anyone with the file can read your readings: store it somewhere safe.
If you open Void Voyagers as a file saved on a computer rather than as the website, other web pages saved on that computer can read its storage. For private use, open the website (it keeps working offline after the first visit).
“Delete all my data” in Crew profile & data removes everything listed above from this device.

No cookies

Void Voyagers does not set or read cookies, and it uses no third-party scripts, fonts or trackers: its fonts, 3D viewer and model are served from the same site as the app.

When something leaves your device

Only when you press a button that says so:

Window to Earth (“Show latest view”) sends the place you chose (its coordinates) to Microsoft’s Planetary Computer to find a recent satellite image from NASA’s HLS data. No health data is sent. If you use your own coordinates, pick a place you are happy to share rather than your home.
Space weather (“Check space weather”) asks NASA’s DONKI service at api.nasa.gov for solar events in the last 30 days. Only a date range and the app’s public demo key are sent, with no health data.
Send report to flight surgeon sends the report you are shown first: your latest reading of each check with its time and age, the findings and advice (which can include your wellbeing and mood answers), symptoms you ticked in the last 24 hours, the emergency log if there is one, your mission environment and day, your pre-flight body mass and bone medication plan, whether it is example data, and an optional callsign (please don’t use your real name). It goes to the team’s inbox, a Supabase database in the EU (Frankfurt). With no connection, the report waits on this device and is sent when the connection returns.

All of these requests are made with cookies switched off and without a referrer. Like any web request, each service sees your IP address and browser type, and keeps it briefly under its own privacy policy. Microsoft and NASA are US organisations. Links to other sites, such as NASA, GitHub and journals, open those sites, where their own privacy policies and cookies apply.

The report inbox

In this prototype the Void Voyagers team reads the inbox. It is not a real flight surgeon, it is not watched around the clock, and nobody will reply with medical advice. If you need help now, contact your crew medical officer, your doctor or local emergency services. Don’t wait for a report.

The public key in the app can only add reports, at most 30 a minute across the inbox; nobody can read them back through it. Reports are deleted automatically 90 days after they arrive.

Why we may use a report, and your rights

We use a report only because you chose to send it: pressing “Send report” is your explicit consent. You can withdraw it at any time by asking us to delete the report. You can also ask for a copy, ask us to correct it, or object to how we use it, through the private report form above, and you can complain to your data protection authority.

Children

Void Voyagers is not meant for children. If you are under 16, use the checks on your device but don’t send a report. If we learn that a report came from a child, we delete it.

Hosting

The website is served by Vercel and Microsoft Azure. GitHub hosts only the source code and the research document. Like any web server, these providers log technical data such as your IP address and browser type to deliver the page and protect against abuse, and keep it for a short time under their own privacy policies. We don’t use these logs to identify or track anyone. Vercel and Microsoft are US companies and may process this data outside the EU under their data processing terms.

Not a medical device

Void Voyagers is a research and training prototype built for the NASA Space Apps Challenge 2026. It does not replace your crew medical officer, flight surgeon or doctor. Do not rely on it for real medical decisions.

Contact

Private questions and deletion requests: the private report form. General questions: open an issue on the project’s GitHub page.