Recent content by mfb

Starliner launch delayed to mid-May A valve in the Atlas V has to be exchanged because excessive vibrations might have damaged it.

A valve issue. Again. Remember June 2023? Or August 2021? Edit: It's a valve issue on the rocket this time, not a Starliner problem.

9 hours and 30 minutes. Still on track for a launch. NASA coverage will start about 4 hours before launch.

You don't need to guess the units of the answer, you need to work with units. ##F = CI \rho \frac{v^2}{2} A = 0.5 \frac{1.225 kg}{m^3} \frac{(20 m/s)^2}{2} 0.1 m^2 = 12.25 kg \frac{m}{s^2} = 12.25 N## This formula is assuming all of the wing has the same velocity relative to the air. Your...

China has launched Chang'e 6, planned to return samples from the far side of the Moon for the first time. The mission profile is similar to Chang'e 5, but landing on the far side means you need a relay satellite for communication. Samples are expected to land on Earth in late June. Chang'e 7 is...

NASA’s Readiness for the Artemis II Crewed Mission to Lunar Orbit - report by the Office of Inspector General We knew there were concerns about the heat shield after Artemis I, but as far as I know we never got to see pictures before. I can see why NASA is concerned:

The reactions are shown in "Latest activity" in your profile, but that also shows all posts you made in between. I don't think there is a page for given reactions only. You can "watch" a thread, or use browser bookmarks or similar tools. The forum doesn't track how many threads were started by...

NASA Updates on Starship Refueling, as SpaceX Prepares Flight 4 of Starship * The internal fuel transfer test during the last flight was successful * The fourth launch is planned in May, maybe as early as the second week * A fuel transfer between two ships is planned for 2025

I can reproduce the problem. The verification works for me but then I'm not logged in on the contact pact, and can't login either. @Greg Bernhardt. https://www.physicsforums.com/misc/contact You can still send a mail manually.

Starliner passed its flight readiness review for the crewed flight test, scheduled for May 7. It is expected to stay at the ISS for about one week. If successful, it will become the second privately developed spacecraft to launch astronauts to orbit, four years after Dragon. It will be the first...

The energy is not generated, it is just converted from one type to another. The mass changes. What is unclear? As an example, a hydrogen atom has a slightly smaller mass than the sum of a proton mass plus an electron mass.

If there is a way to make a diode to isolate inputs then it should be possible to make logic gates out of it. Getting the timing of all signals right will be a challenge as we rely on signals that always move. Make time steps of half the refractory period. Define an on ->off sequence as 1 and...

Assuming proton decay is possible, the energy released is too large to stabilize them in any way. Neutrons can decay via equivalent methods then, their environment doesn't matter either.

Only if they abuse the monopoly. SpaceX saves its customers billions.

2023 launch statistics and analysis Mass to orbit by rocket: SpaceX launched 5 times more mass than the rest of the world combined.