grb090423, to random avatar

Blowtorch effect of satellite reentry.

"It’s important because large system integrators – the big companies that lead satellite projects – are going to need systems that are fully compliant with debris mitigation regulations. And the need is becoming urgent as more and more satellites are placed in space.”

thejapantimes, to worldwithoutus avatar

South Korea launched its second domestically made spy satellite on a SpaceX Falcon 9 rocket, enabling it to keep closer tabs on threats from the likes of nuclear-armed North Korea.

mattotcha, to random avatar
JohnBarentine, to Starlink avatar

“Using the current population of we find that the brightest satellites would be naked-eye visible in dark skies, but the high sky brightness during totality will make them undetectable to the unaided eye.”

mattotcha, to Astronomy avatar
Nonilex, to TeslaMotors avatar

Exclusive: #Musk's #SpaceX is building #SpySatellite network for #UnitedStates #intelligence agency

Spacex is building a network of hundreds of spy satellites under a #classified contract w/a US intelligence agency, 5 sources familiar w/the program said, demonstrating deepening ties between billionaire entrepreneur #ElonMusk's space company & #NationalSecurity agencies.

Nonilex, avatar

Reuters reporting discloses for the first time that the #SpaceX contract is for a powerful new #spy system w/hundreds of #satellites bearing Earth-imaging capabilities that can operate as a swarm in low orbits, & that the spy agency that Musk's company is working w/is the #NRO.

Reuters was unable to determine when the new network of satellites would come online & could not establish what other companies are part of the program w/their own contracts.

#NationalSecurity #geopolitics #ElonMusk

JohnBarentine, to space avatar

A striking representation of the number of objects launched into space each year since Sputnik I in 1957 based on data from the United Nations Office for Outer Space Affairs (via @ourworldindata)

#Space #Satellites #SpaceSustainability

thejapantimes, to Japan avatar

Tokyo-based startup Space One failed to become Japan's first private firm to put a satellite into orbit, when its solid-fuel Kairos rocket burst into flames just seconds after liftoff, in a major setback for Japan’s space development aspirations.

alanboyle, to space avatar

DATA ... IN ... SPACE! A freshly minted startup called says it has raised $2.4 million for a plan to send up hundreds of satellites to process and downlink data collected by other in orbit.

spaceflight, to solar avatar

📆 2023 This study by for proposes a 29,339 m2 ☀️ collector at the point, from 🌙 materials, transported by a 🚠 from the

spaceflight, avatar

In 📆 2022, the was estimated to be worth US$350 billion 💵 and is projected to grow 📈 to more than one trillion 💰 dollars over the next two decades. Actors such as already own a majority of the 🛰️ . In the absence of a concerted global 🌏 dialogue, individual countries are pushing ahead with their own laws. Usually, international arrangements tend to arise 🥱 when there is a real risk of .

PolarBremen, to climate avatar

We are hiring: two positions in remote sensing of sea ice. If you are interested in , amplification, , and physics join our team:

thejapantimes, to Japan avatar

Tokyo-based startup Space One, racing to be Japan’s first private-sector firm to put a satellite into orbit, postponed the launch of its solid-fueled rocket on Saturday morning.

JohnBarentine, to space avatar

What could possibly go wrong?

"About 10% of the particles floating around the stratosphere now come from the aerospace industry, and we don't know if this could impact the climate."

thejapantimes, to Japan avatar

Japan’s Air Self-Defense Force said Saturday that it had conducted joint training with two U.S. Air Force B-52 heavy bombers over the Sea of Japan and East China Sea, in what was seen as a show of force to both Beijing and Pyongyang.

JohnBarentine, to space avatar

.@sundogplanets: "Get out and enjoy your dark skies, before they change. With proper regulation, our oldest form of space exploration can continue. I desperately hope we never reach a point where the natural patterns in the sky are drowned out by anthropogenic ones, but without regulation, corporations will get us there soon."

'Even outer space now succumbs to human pollution':

thejapantimes, to worldwithoutus avatar

An expert has confirmed that North Korea's first spy satellite is "alive," though its capabilities remain unknown despite maneuvers suggesting Pyongyang's successful control of it.

JohnBarentine, to Astronomy avatar

The U.S. has issued a notice of rulemaking concerning a proposal to allow direct-to-mobile communications between and the ground.

If new rules take effect, it would be pretty bad for radio . And it would directly undermine the concept of Radio Quiet Zones.

The notice is publicly available on but has not been published in the Federal Register. When it is, a 30-day public comment period will commence.

JohnBarentine, to Starlink avatar

"In the past year, the amount of collision-avoidance maneuvers that needed to happen with the constellation were an order of magnitude greater than they were in the past five years combined."

drahardja, to random avatar

Late to the party, but I’m starting to think that letting corporations launch thousands of satellites into low earth orbit is not a great idea.

I know that companies that launch devices into orbit have to have a deorbit plan at their end of life (thanks FCC), but I wonder if plans for individual satellites scale to the thousands, or if this is sufficient to prevent the inevitable loose crap and debris clogging up LEO and risking creeping closer to the Kessler effect.

I wonder if an insurance fund could be started to clean up future trash in LEO, and everyone who launches an orbiting body has to pay into it. And I wonder if such a rule would make these operations unprofitable—and if that were the case, then why are we letting them privatize their profit while the public foots the bill for their potential risk?

spaceflight, to Starlink avatar

🛰️ operate in a below 600 km altitude. With drag at these levels, satellites are naturally deorbited ⤵️ in five years or less. initiated controlled descents on 406 satellites out of nearly 6000 Starlink satellites launched to date. It plans controlled descents on ~ 100 additional early-version 1 Starlink satellites.

grb090423, to Starlink avatar
JohnBarentine, to space avatar

New work by Hainaut and Moehler (European Southern Observatory) simulated the effects of large satellite constellations on astronomical spectroscopy, find that although the probability of contamination is low, "some of these contaminated spectra will be difficult to identify".

psa, to voyager avatar
JohnBarentine, to space avatar

"According to data from the United Nations Office for Outer Space Affairs, 2023 was a record year for launching satellites, probes, landers and more into space. But scientists worry those plumes of exhaust trailing behind rockets could be scattering harmful pollutants into the pristine upper layers of the atmosphere." (via @PBSNewsHour)

#Space #SpaceSustainability #SpaceEnvironment #Atmosphere #Climate #Satellites

thejapantimes, to Japan avatar

Can Japan's H3 rocket — which was launched successfully on Saturday — seriously compete with Elon Musk's Falcon 9? Experts say price and usability would be key.

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