This Week in Space & Science

Some weeks in space news are about a single spectacular image. This one was about seeing through things we thought we already understood. Under Greenland, a NASA-led team read faint wrinkles on the ice sheet's surface and produced the most detailed map yet of the rock beneath — 1,943 subglacial valleys, about a third of them previously unknown, some stretching hundreds of kilometers farther inland than older maps allowed. On Mars, a reanalysis of polar ice found the north cap far cleaner than models had assumed, with dust at roughly 3 percent by mass instead of 25. And in deep space, the James Webb Space Telescope returned to a galaxy cluster Hubble photographed in 2014 and found a cosmic house of mirrors: hundreds of additional galaxies, and the same background objects appearing four or more times, bent by gravity.

Hardware moved just as fast. SpaceX flew three Falcon missions, landed four first stages, and docked a Dragon at the International Space Station in under thirteen hours. NASA put $359 million behind Boeing's effort to return Starliner to flight. Starlink satellites started raising orbits on argon ion engines, and the company opened a beta that lets property owners share a dish with paying neighbors. Côte d'Ivoire signed the Artemis Accords. A nearby binary, 70 Ophiuchi, was shown to have stable orbits in the habitable zone of its larger star.

What advanced our understanding of the universe this week was not a single eureka so much as better seeing: better bedrock, cleaner ice, more distant galaxies, and a launch industry that now treats orbit as a schedule rather than an occasion.

Top Stories

Webb finds a cosmic house of mirrors

The James Webb Space Telescope imaged galaxy cluster MACS J0454.1-0300 in far greater detail than Hubble's 2014 view of the same field. Webb's sensitivity to redder light revealed hundreds of additional galaxies, while the cluster's mass bent and magnified light from much more distant orange galaxies so that some objects appear four or more times. Researchers identified a group of galaxies from when the universe was two billion years old and an individual galaxy from when it was just 800 million years old — the first time multiple images of the same galaxy have been spotted more than once in this cluster. ▶ Episode 209 · 2026-09-30

Hundreds of hidden valleys under Greenland

A newly developed method called Ice Flow Perturbation Analysis produced the most detailed view yet of the bedrock beneath the Greenland Ice Sheet. Researchers manually mapped 1,943 subglacial valleys; about a third are newly identified, and about half of the valleys already in BedMachine Greenland now extend farther inland, in some cases by hundreds of kilometers. Long, straight valleys in the west-central region formed well before most of the ice above them existed. The NASA-led paper appeared in Geophysical Research Letters. ▶ Episode 207 · 2026-09-28

Three Falcons, four landings, one docking

SpaceX completed three Falcon launches, four first-stage landings, and a Dragon docking to the station in under thirteen hours. The sequence included a Crew-13 astronaut mission from Cape Canaveral and a Transporter-18 rideshare, arriving as World Space Week 2026 opened on a theme of reusable rockets. For decades, reaching space was expensive and tightly controlled; this week it looked like a transportation system on a timetable. ▶ Episode 211 · 2026-10-03

Mars polar ice is far cleaner than models predicted

Using data from the OMEGA spectrometer, CRISM, and the Surface Stereo Imager on the Mars Phoenix Lander, researchers recalculated dust in the north polar cap and arrived at about 3 percent dust by mass for the top ice layer — not the 25 percent earlier models assumed. The revision comes from recognizing a multilayered structure of ice over thin dust layers over more ice, with seasonal frost looking dustier in winter and cleaner ice exposed in summer. Cleaner ice changes the cap's heat balance, how well it preserves a climate record, and how we count accessible water at the pole. ▶ Episode 210 · 2026-10-01

NASA funds Starliner's return — and a longer wait for crew

NASA will pay Boeing $359 million to return Starliner to flight and help certify the Vulcan rocket for missions in the 2030s. An unpiloted test flight is planned by the end of the year; if it goes well, a crewed mission is hoped for mid-2028, with redesigned propulsion-system valves after the failures of 2024. Officials confirmed the next crewed Starliner flight will not occur until 2028. ▶ Episode 208 · 2026-09-29

Mission Updates

James Webb Space Telescope. Imaging of MACS J0454.1-0300 from programmes 5058 and 6882 shows gravitational lensing in unusual detail, including repeated multiple images of the same background galaxy. ▶ Episode 209 · 2026-09-30

Hubble Space Telescope. The 2014 cluster image remains Webb's comparison point. Astronomy Picture of the Day continues as a classroom staple from elementary school through graduate courses. ▶ Episode 207 · 2026-09-28

Boeing Starliner. Return-to-flight funding is in place. Uncrewed test targeted for late 2026; crewed flight not before 2028. ▶ Episode 208 · 2026-09-29

SpaceX Falcon 9, Dragon, and Crew-13. Three launches, four booster landings, and a station docking are complete. ▶ Episode 211 · 2026-10-03

Starlink. Satellites are raising orbits with argon ion engines toward 350–450 km, with expected lifetimes around five years. A Communities beta lets hosts share one kit with neighbors who buy short-term passes. ▶ Episode 209 · 2026-09-30 · ▶ Episode 212 · 2026-10-04

Artemis and crew health. Côte d'Ivoire signed the Artemis Accords. A Mayo Clinic Proceedings study found elevated hip-fracture rates among U.S. astronauts after flights longer than 90 days, a caution for extended lunar missions. ▶ Episode 208 · 2026-09-29 · ▶ Episode 210 · 2026-10-01

ESA. The agency joins the 77th International Astronautical Congress in Antalya, Türkiye, 5–9 October, with the Director General set for a plenary. ▶ Episode 211 · 2026-10-03

Research Spotlight

The most quietly consequential paper of the week is the NASA-led map of Greenland's buried valleys, published in Geophysical Research Letters.

Greenland's ice sheet covers 1.7 million square kilometers and is more than three kilometers thick at its deepest. Radar and earlier compilations such as BedMachine Greenland already sketched the rock below, but large stretches remained poorly resolved. Ice Flow Perturbation Analysis works from a simple physical idea: as ice flows over valleys and ridges, it leaves subtle signatures on the surface. Read those signatures carefully enough, and you can infer the topography you cannot see.

Researchers then mapped 1,943 subglacial valleys by hand. About a third had not been identified before. About half of the valleys already in BedMachine now run farther inland than that map indicated, sometimes by hundreds of kilometers. In west-central Greenland, long, straight valleys appear to have been carved well before most of the ice now sitting on them existed.

Ice does not slide uniformly. It is steered by the shape of the bed, especially along troughs that can speed outlet glaciers toward the ocean. A more complete valley map improves models of how the ice sheet will respond as the climate warms, and therefore how much Greenland will contribute to sea-level rise. It also revises our picture of Greenland before glaciation: a dissected landscape, not a blank slate. The method may travel to Antarctica and other ice sheets, wherever surface flow still encodes the hidden bed. ▶ Episode 207 · 2026-09-28

Launch Calendar

World Space Week continues through 10 October, marking Sputnik 1 (4 October 1957) and the Outer Space Treaty (10 October 1967). The 77th International Astronautical Congress opens Monday, 5 October, in Antalya and runs through Friday, 9 October.

NASA and Boeing are targeting an unpiloted Starliner test by the end of 2026, with a crewed flight no earlier than mid-2028. Starlink satellites will keep raising orbits in the coming days. No additional named orbital launch windows for next week were detailed in this week's episodes.

On 3 October 1942, the V-2 made its first successful flight from Peenemünde, reaching about 60 miles — a grim origin story for technologies World Space Week now celebrates in reusable form. ▶ Episode 211 · 2026-10-03 · ▶ Episode 212 · 2026-10-04

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