Two private astronauts took a spacewalk Thursday morning—yes, it was historic

FlyingSquid , 5 hours ago

Maybe we shouldn’t have a commercial space industry?

www.statesman.com/story/news/…/74171065007/

Rhaedas , 2 hours ago

Paywall, got a summary?

And assuming the topic from the link, is even very active commercial launching comparable to the rest of the emissions we're doing?

zaph , 2 hours ago

As the space industry grows globally, so does its damage to the environment. Researchers at the University of Southern California released a study saying that satellites are significantly damaging Earth’s ozone layer. As their materials burn up upon reentry, leaving behind particle pollutants made up of aluminum oxides, which are “known catalysts for chlorine activation that depletes ozone in the stratosphere.” Since 2016, the ozone layer has seen eight times as many of those pollutants, with an estimated 17 metric tons in 2022. The ozone layer is already fighting to recover from past damage caused by chlorofluorocarbons, chemicals that were commonly used in refrigeration, air conditioning, foam blowing and as propellants in aerosol sprays. The Environmental Protection Agency previously forecasted full recovery within the next 25 to 35 years, but this estimate was dependent upon a continued decrease in ozone-depleting substances — a condition that is increasingly unlikely as SpaceX, Amazon and other companies seek to expand their satellite activity. What is Starlink?

Starlink leads the globe in satellite activity, and of the 8,100 objects in low Earth orbit, about 6,000 are Starlink satellites. These satellites provide high-speed, low-latency internet access to remote areas around the world.

The satellites are part of Elon Musk’s SpaceX, the top manufacturer of technology for private space exploration. SpaceX also manufactures various spacecrafts and rockets, including its huge Starship that it launches from South Texas at the company’s Starbase in Boca Chica, a beach town that sits off the Gulf of Mexico about 20 miles from the border. Why is the ozone layer important?

The ozone layer protects us by acting as a filter between the sun and the Earth’s atmosphere. Located in the stratosphere, the ozone layer absorbs the majority of the sun’s high-energy UV radiation, which can cause skin cancer, cataracts and other health issues in humans, as well as harm animals and plants.

Rhaedas , 2 hours ago

Thanks. I recall seeing this info before, and I questioned the same thing before. While any depletion is bad, is 17 tons the windmill to attack when other emissions affecting ozone and other effects are far, far greater? I get that it's saying a larger increase means more residuals left, but can we possibly pump out satellites anywhere close to what's done from the ground?

I can't find any very recent numbers, but here's an example of what I've found both in emissions and potential emission sources. https://news.mit.edu/2020/emissions-ozone-cfc-chemicals-0317. I just don't see satellite reentry as the headline it's made out to be, plus we can find alternates that reduce it further.