Our 240-Light-Year Radio Bubble Is Effectively Invisible — Even Up Close

Our 240-Light-Year Radio Bubble Is Effectively Invisible — Even Up Close

A sphere of electromagnetic radiation is expanding from Earth at the speed of light, growing since the 1930s when our signals first became powerful enough to escape the ionosphere. A Reddit user built a visualization of this bubble using real stellar positions from the HIPPARCOS star catalogue, mapping which stars have received our signals and when.

The results are humbling. Proxima Centauri received our first signals around 1904. Vega, the star from Contact, has been receiving us since 1925. The Pleiades cluster, at 440 light-years out, won't know we exist for another 314 years. And Voyager 1, sitting at roughly 170 AU from Earth, is still inside the innermost shell of that bubble.

The sobering part: by the time a 1980s TV broadcast reaches a star 50 light-years away, it's indistinguishable from background cosmic noise. Detecting Earth's radio leakage from just one light-year out would require a receiver roughly 900 kilometers in diameter.

Gobble's Take: Nearly a century of signals, and the universe still can't pick up the static.

Source: r/astronomy

SpaceX Plans to Send Robotic Starships to Mars as Early as 2026

Before any human sets foot on Mars, a fleet of autonomous Starships will go first — and according to SpaceX's published roadmap, that advance guard could launch as early as 2026, with follow-up missions in 2028.

The primary goal of these uncrewed missions is proving Entry, Descent, and Landing on Mars, a notoriously brutal engineering challenge given the planet's thin atmosphere, which is too thick to ignore but too thin to rely on for conventional braking. Once down, the robotic Starships won't just sit there: the plan calls for deploying solar arrays, prospecting for resources, and beginning to extract carbon dioxide from the Martian atmosphere to produce propellant on-site. That last step matters enormously — Starship will need to generate propellant on the Martian surface to have any hope of returning to Earth.

SpaceX self-funded Starship's development from 2012 onward, and in 2021 NASA awarded the company a $2.89 billion contract to adapt a version of the vehicle as a lunar lander for the Artemis program. The Mars program represents a far larger ambition, and the robotic precursor missions are the opening move in what SpaceX frames as building humanity's first off-world settlement.

Gobble's Take: Your Roomba struggles with chair legs; SpaceX's version needs to survive Martian atmospheric entry and then build a fuel depot.

Source: Chris's Substack

Starship V3 Has a Launch Date — and a New Trick

SpaceX's newest and largest Starship variant, dubbed V3, now has a debut launch date according to Space.com, and Flight 12 will reportedly do something no Starship has done before: take a good look at itself mid-flight.

According to Space.com, SpaceX fueled the V3 rocket for the first time in May ahead of that crucial test flight, a key milestone in validating the vehicle before it leaves the pad. The company has also confirmed it is "constantly exploring" options to launch Starship from sites outside the United States — a signal that SpaceX views its megarocket as infrastructure that will eventually need more than one home port.

V3 represents the latest iteration of the vehicle that SpaceX intends to use for both Artemis lunar landings and eventual Mars missions. Each generation has grown more capable, and the self-inspection feature planned for Flight 12 suggests the company is building in new diagnostic capabilities as the hardware matures.

Gobble's Take: A rocket that can check its own work mid-flight is either the most reassuring engineering milestone of the year or the most ominous, depending on what it finds.

Source: Space.com

Quick Hits

• Artificial hearts grow better in space than on Earth: Researchers studying cardiac tissue in microgravity found that artificial hearts develop more effectively off-planet — a finding that could reshape both space medicine and terrestrial transplant science. Space.com
• Space junk is now an air pollution problem too: Lasers are being used to study how debris burning up on reentry contributes to atmospheric pollution, adding a new dimension to the growing orbital congestion crisis. Space.com

In Case You Missed It

Yesterday's top stories:

• The Day Space Became a Trillion-Dollar Battlefield
• The $2.32 Trillion Space Economy — and Why Germany Is Quietly Positioning to Win It
• Apollo 15's Astronauts Carried Unauthorized Postal Covers to the Moon — and Got Caught