I'm incredibly excited, as part of the Ars Live series, to host a conversation with three of the very best space reporters in the business on Thursday, May 29, 2025, at 2:30 pm Eastern about the future of NASA and its deep space exploration ambitions.

Joining me in a virtual panel discussion will be:

• Christian Davenport, of The Washington Post
• Loren Grush, of Bloomberg
• Joey Roulette, of Reuters

The community of professional space reporters is fairly small, and Chris, Loren, and Joey are some of my smartest and fiercest competitors. They all have deep sourcing within the industry and important insights about what is really going on.

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For the last three months or so, I've been learning to use (and love) a Bambu Labs A1 3D printer, a big, loud machine that sits on my desk and turns pictures on my computer screen into real-world objects.

In the first part of my series about diving into the wild world of 3D printers, I covered what I'd learned about the different types of 3D printers, some useful settings in the Bambu Studio app (which should also be broadly useful to know about no matter what printer you use), and some initial, magical-feeling successes in downloading files that I turned into useful physical items using a few feet of plastic filament and a couple hours of time.

For this second part, I'm focusing on what I learned when I embarked on my first major project—printing upgrade parts for the A1 with the A1. It was here that I made some of my first big 3D printing mistakes, mistakes that prompted me to read up on the different kinds of 3D printer filament, what each type of filament is good for, and which types the A1 is (and is not) good at handling as an un-enclosed, bed-slinging printer.

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SpaceX made some progress on another test flight of the world's most powerful rocket Tuesday, finally overcoming technical problems that plagued the program's two previous launches.

But minutes into the mission, SpaceX's Starship lost control as it cruised through space, then tumbled back into the atmosphere somewhere over the Indian Ocean nearly an hour after taking off from Starbase, Texas, the company's privately-owned spaceport near the US-Mexico border.

SpaceX's next-generation rocket is designed to eventually ferry cargo and private and government crews between the Earth, the Moon, and Mars. The rocket is complex and gargantuan, wider and longer than a Boeing 747 jumbo jet, and after nearly two years of steady progress since its first test flight in 2023, this has been a year of setbacks for Starship.

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On Tuesday afternoon, just a few hours before a launch attempt of the ninth flight test of SpaceX's Starship vehicle, Elon Musk spoke with Ars Technica Senior Space Editor Eric Berger to talk about where his space company goes from here.

In recent weeks, Musk has dialed back his focus on politics and said he wants to devote the majority of his time to SpaceX and his other companies. So what does that mean?

The conversation came just ahead of the opening of Starship's launch window, at 6:30 pm CT (23:30 UTC) in South Texas. Here is a lightly edited transcript of the interview.

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On Sunday, independent AI researcher Simon Willison published a detailed analysis of Anthropic's newly released system prompts for Claude 4's Opus 4 and Sonnet 4 models, offering insights into how Anthropic controls the models' "behavior" through their outputs. Willison examined both the published prompts and leaked internal tool instructions to reveal what he calls "a sort of unofficial manual for how best to use these tools."

To understand what Willison is talking about, we'll need to explain what system prompts are. Large language models (LLMs) like the AI models that run Claude and ChatGPT process an input called a "prompt" and return an output that is the most likely continuation of that prompt. System prompts are instructions that AI companies feed to the models before each conversation to establish how they should respond.

Unlike the messages users see from the chatbot, system prompts typically remain hidden from the user and tell the model its identity, behavioral guidelines, and specific rules to follow. Each time a user sends a message, the AI model receives the full conversation history along with the system prompt, allowing it to maintain context while following its instructions.

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Currently, there are no nuclear power plants scheduled for construction in the US. Everybody with plans to build one hasn't had a reactor design approved, while nobody is planning to use any of the approved designs. This follows a period in which only three new reactors have entered service since 1990. Despite its extremely low carbon footprint, nuclear power appears to be dead in the water.

On Friday, the Trump administration issued a series of executive orders intended to revive the US nuclear industry. These include plans to streamline the reactor approval process and boost the construction of experimental reactors by the Department of Energy. But they also contain language that's inconsistent with other administration priorities and fundamentally misunderstands the use of nuclear power. Plus, some timelines might be, shall we say, unrealistic: three new experimental reactors reaching criticality in just over a year.

Slow nukes

The heyday of nuclear plant construction in the US was in the 1970s and 80s. But the 1979 partial meltdown at the Three Mile Island plant soured public sentiment toward nuclear power. This also came at a time when nuclear plants typically generated only half of their rated capacity , making them an expensive long-term bet. As a result, plans for many plants, including some that were partially constructed, were canceled.

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National Public Radio sued President Trump and his administration today over Trump's move to block funding for public broadcasting. NPR said Trump acted illegally, and that losing federal funding could force it to shut newsrooms and dramatically scale back news coverage.

On May 1, Trump issued an executive order titled, "Ending Taxpayer Subsidization of Biased Media," in which he ordered the Corporation for Public Broadcasting (CPB) and all US agencies to cease federal funding for NPR and PBS. The White House had previously alleged that NPR and PBS "spread radical, woke propaganda disguised as 'news.'"

NPR's lawsuit in US District Court for the District of Columbia asked the court to declare Trump's executive order and all actions to implement it unconstitutional. NPR's lawsuit said that Trump "has no authority under the Constitution to take such action. On the contrary, the power of the purse is reserved to Congress, and the President has no inherent authority to override Congress's will on domestic spending decisions. By unilaterally imposing restrictions and conditions on funds in contravention of Congress, the Order violates the Separation of Powers and the Spending Clause of the Constitution."

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Police have arrested a third suspect linked to one of the most extreme bitcoin-related kidnapping and torture cases in the United States, The New York Times reported .

The arrest came after an Italian man, Michael Valentino Teofrasto Carturan, escaped a luxury Manhattan townhouse after three weeks of alleged imprisonment.

Running to a traffic agent for help, he later told police that he was tortured by colleagues for his bitcoin password, "bound with electrical cords and whipped with a gun," his feet submerged in water while a Taser gun sent jolts through his body, the NYT reported. At times he feared for his life—allegedly once held suspended from the ledge of the fifth-story building—but he seemingly never gave up his password, a resistance that only prompted more extreme violence.

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This article originally appeared on Inside Climate News , a nonprofit, non-partisan news organization that covers climate, energy, and the environment. Sign up for their newsletter here .

PASADENA, Calif.—Nicole Byrne watched anxiously from across the small kitchen in her home as Parham Azimi, a Harvard University researcher, lined up sample bottles next to the running tap.

As his phone timer chimed, indicating the water pipes had been flushed for the required five minutes, Azimi began filling collection bottles and packing them to be mailed to a lab in San Diego later that day.

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