Tiny Robots, Alien Caves: NASA's Plan for Titan

Today on Astronomy Daily: propeller-free robot spheres for Saturn’s strangest moon, SpaceX’s new launch-turnaround record, Rocket Lab’s biggest defense contract yet, and a solar storm arriving tonight. Episode: “S05E169”

Saturn’s largest moon, Titan, has lakes and rivers of liquid methane, a thick hazy atmosphere, and — scientists suspect — a hidden network of caves and sinkholes carved not by water, but by liquid hydrocarbons eating through water ice. It’s a landscape no wheeled rover and no simple flying drone is built to handle. On today’s episode, Anna and Avery dig into NASA’s newest, strangest idea for exploring it: small, spherical robots with no propellers at all. Then it’s a run through three more stories from the last few days — a new SpaceX launch record, Rocket Lab’s largest-ever defense contract, and a geomagnetic storm that’s rolling in as this post goes live. Here’s the rundown, with links to everything referenced.

Robot spheres for an alien cave system

NASA’s Innovative Advanced Concepts program — NIAC, the agency’s fund for early-stage, high-risk, high-reward mission ideas — has awarded a Phase 1 grant to a concept called SPARK: Solid-state Propulsion for Autonomous Reconnaissance of Karst. “Karst” is the geology term for terrain shaped by dissolving rock — on Earth, that means limestone sinkholes and cave systems carved by water. On Titan, the same basic process plays out with liquid methane and ethane instead of water, and water ice standing in for rock, at surface temperatures around minus 179 degrees Celsius.

The team behind SPARK — led by Daniel Drew, an assistant professor at the University of Hawaii, working with JPL’s Ethan Schaler and Jacob Izraelevitz and Michael Malaska of the Blue Marble Space Institute of Science — has designed small spherical robots that fly using electrohydrodynamic (EHD) propulsion: a solid-state electric thruster system with no propellers and no moving parts to break down in Titan’s harsh environment. Drew describes the advantage plainly: the design offers “persistence, maneuverability, robustness to the challenging near-cryogenic conditions, and minimizes downwash disturbance of scientifically important hydrocarbon layering.” That last point matters more than it might sound — a conventional propeller drone would stir up and contaminate the very surface chemistry researchers want to study undisturbed. A solid-state thruster barely touches the surrounding atmosphere by comparison.

Titan actually plays to the aerobots’ advantage in one respect: its atmosphere is denser than Earth’s at the surface, and gravity is only about a seventh of Earth’s, meaning flight there takes far less power than it would here. It isn’t the first time NASA has circled this problem, either — an earlier JPL concept called Shapeshifter, dating to around 2019, proposed modular “cobots” that could roll, fly, chain together for cave descents, or reconfigure into a swimming probe for the lakes. That project never flew, but it underlines how long engineers have been wrestling with the same basic challenge: how do you get real eyes into Titan’s caves and beneath its lake surfaces?

SPARK’s Phase 1 grant covers nine months of concept maturation, with a possible two-year Phase 2 award to follow if it clears review. There’s no confirmed mission tie-in yet — NASA’s Dragonfly rotorcraft, already funded and targeting a Titan launch around 2028, is the obvious candidate, but Drew has been upfront that integration with Dragonfly specifically isn’t locked in. This is very much a technology-maturation project first, looking for the right mission to fly on.

The scientific stakes are real, if this ever leaves the lab: Titan’s subsurface, particularly anywhere liquid water might mix with its surface organic chemistry, is considered one of the more promising astrobiology targets in the solar system. Caves — sheltered, chemically rich, protected from surface radiation — are exactly the kind of environment scientists would want to examine closely for clues about prebiotic chemistry. Most NIAC Phase 1 concepts never make it to flight hardware. The ones that do have a track record of reshaping mission architectures years down the line.

SpaceX breaks its own launch-turnaround record

On the night of August 15, SpaceX launched two separate Falcon 9 missions just 38 minutes apart, from opposite coasts of the United States. The first lifted off at 9:12 p.m. Eastern from Cape Canaveral Space Force Station in Florida, carrying eight Globalstar telecommunications satellites deployed over roughly six minutes. The second went up at 9:50 p.m. Eastern from Vandenberg Space Force Base in California, carrying the classified USSF-366 mission for the U.S. Space Force, widely believed to be built on SpaceX’s Starshield national-security satellite platform.

The 38-minute gap beats SpaceX’s own previous record of 65 minutes, set in August 2024 — a 27-minute improvement that required two different pads, two different states, and two separate mission control teams to line up almost simultaneously. Both first-stage boosters landed successfully: the Globalstar booster on its 14th flight, and the USSF-366 booster — on its 18th — touching down on the droneship “Of Course I Still Love You” in the Pacific. The launches brought SpaceX’s 2026 total to 96 Falcon 9 missions so far, roughly three-quarters of them dedicated to building out the Starlink constellation — a cadence that has made individual Falcon 9 launches increasingly routine, to the point that it now takes a genuine record to stand out.

Rocket Lab’s biggest defense contract yet: $397 million for “Flatellites”

Rocket Lab has been awarded a $397 million contract from the U.S. Space Force to build and launch a constellation of flat-panel satellites called Flatellites, supporting a program known as SB-AMTI — Space-Based Airborne Moving Target Indicator — designed to track airborne threats from orbit in near-real time. Rocket Lab CEO Peter Beck said the company is “proud to contribute to the deployment of a resilient space-based sensing layer that will enhance the Joint Force’s ability to operate in contested airspace.”

The flat-panel design allows far more satellites to be packed per launch than a traditional boxy satellite shape — the same basic logic behind SpaceX’s flat-pack Starlink redesign — and each Flatellite carries low-latency, high-bandwidth communications alongside its sensing payload. They’re slated to launch stacked aboard Rocket Lab’s Neutron rocket, which still hasn’t flown and continues to hedge on a firm 2026 debut date. It’s a notable vote of confidence in Rocket Lab’s execution record that customers keep signing on to fly aboard a rocket that hasn’t reached the pad yet. This is Rocket Lab’s largest defense contract to date; combined with three other government contracts announced earlier this year — worth $190 million, $90 million and $266 million — the company has now secured $943 million in defense funding in 2026 alone.

Watch the sky tonight: a geomagnetic storm is arriving

A double coronal mass ejection combined with a high-speed solar wind stream is forecast to reach Earth today, August 17, with forecasters — including the British Geological Survey — predicting G1 to G2 level geomagnetic storming (minor to moderate on the scale that runs to G5). The geomagnetic background has been unsettled since August 16, with the main impact expected in the second half of today as the bulk of the solar material arrives.

The upside for skywatchers: aurora is possible at high latitudes, potentially including Scotland, northern England, Northern Ireland, Alaska, Canada and the northern tier of the United States from Washington state to Maine, and in the Southern Hemisphere, southern New Zealand and Tasmania. The storm arrives amid an active stretch for the Sun — sunspot region AR4507 alone produced at least ten C-class flares between August 15 and 16, including a C3.7 event at 3:31 UTC on the 16th, part of a broader pattern of filament eruptions, flares and Earth-directed CMEs as the current 11-year solar cycle stays active. Forecast models don’t fully agree yet on exact timing or intensity, so treat this as a “worth stepping outside and checking” situation rather than a guarantee — but if you’re in the right latitude band and skies are clear tonight, it’s worth a look up.

Listen to the full episode

Anna and Avery cover all four stories in full on today’s episode of Astronomy Daily — S05E169, out now. [Listen here] and find full show notes, timestamps and sources on the episode page.

Sources: Space.com — NASA’s Titan aerobots · JPL Robotics — Titan Aerobots · JPL — Shapeshifter background · Space.com — SpaceX record double launch · Spaceflight Now — Globalstar/USSF-366 coverage · Space.com — Rocket Lab’s Flatellites contract · Rocket Lab — Flatellites announcement · ummid.com — Geomagnetic storm forecast · EarthSky — Sun news updates