# Tag Info

Accepted

### Why isn't SpaceX's Starship "trial and error" development strategy an open source project?

There are many reasons. They include money, intellectual property, regulations, and Elon Musk. Money. Building open source software is relatively inexpensive, sometimes ridiculously inexpensive. No ...
• 71.3k
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### How much of the world's xenon has been used in spaceflight altogether? Is it a lot? Did it cost a lot?

According to Wikipedia's article about xenon, the gas occurs at 87 ppb (parts per billion) by volume in Earth's atmosphere. Earth's atmosphere weighs 5.15×1018 kg. Dividing this by the density of air (...
• 116

### What is the relationship (if any) between NASA's Kilopower project and its request for 40 kW reactor designs?

Kilopower is designed for at most 10 kW of power. I asked Patrick McClure, who is the engineer in charge of the Kilopower project at Los Alamos (2019 Humans to Mars summit) if they could scale it up ...
• 120k
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### Starlink vs 5G technology, are they directly competing services?

This partial answer is not about the technical possibilities, but about Starlink's hypothetical relationship to 5G. SpaceX's plans with Starlink are unclear at the moment. On the one hand, one should ...
• 5,385

### When was advertising on Earth from space first proposed? By who?

In Robert Heinlein's 1950 Novella "The Man Who Sold the Moon", the central character raises the possibility of using the moon as a billboard. He does not actually propose to do it, but he ...
• 8,084
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### Regulations preventing SpaceX from saying "no" if OneWeb asked them to launch their satellites?

There are no such regulations, so I can't think of any reason why SpaceX couldn't refuse to launch a competitor's satellites. The relevant regulator here is the FAA, and specifically AST. AST ...
• 1,403
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### Why is the Space industry expected to flourish and grow in the near future?

Private companies have been trying to get into the launch business since the 80s (ORTRAG in Germany since the 70s), usually turning into a financial disaster for the investors. Several things have ...
• 4,257

### Were there any non-state organizations to organize space flight and colonizations in the second half of the 20th century?

There was a lot of work with sounding rockets after World War II. Those are rockets that go up and come back down--they are not intended to enter orbit, which is actually a much more difficult problem ...
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### Has anything "changed" about the way that NASA will procure technology for the Artemis program?

This applies to the HLS elements as well, but NASA has recently been requiring Firm Fixed Price Contracts (To avoid ballooning costs, like on SLS) alongside the result of the contract being NASA ...
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