Recent content by mfb

I have no idea how to parse this run-on sentence. What is your question? That's a statement about forces, not energy. Different from what? The difference in unordered kinetic energy of water molcules is the gain in thermal energy if you heat water. E = mc^2 is the energy of an object at rest.

The cleaned up neutrino thread is here: CERN team claims measurement of neutrino speed >c (confirmation)

Launch window calendar: February 6, 7, 8, 10, 11 March 6, 7, 8, 9, 11 April 1, 3, 4, 5, 6, 30 Each day has a 120 minute launch window during the local night. You want a fixed orientation between launch site and direction of the Moon, which happens every ~25 hours. Artemis II will fly around new...

The rocket for Artemis II will roll out in two hours Alternative coverage The launch is still planned for February 6. It will be the first time in over 50 years that humans leave low Earth orbit again, and fly around the Moon.

Successful return of Crew-11, the crew just left the capsule. Everything looked completely normal. If it's something related to zero-g then we might learn about it eventually, otherwise it's completely up to that crew member. SpaceX has launched 72 people and returned 74, with the difference...

Crew-11 will return earlier It won't be an emergency return, they'll follow the normal procedures and wait for a regular landing opportunity. The crew member is stable but they aren't sure what it is and the ISS doesn't have the diagnostic tools of a hospital. Whatever it is, I hope they can...

Mars being slower at aphelion wins over the other effects. Earth's orbital velocity is 29.3 km/s to 30.3 km/s with an average of 29.8 km/s. Mars' velocity varies between 26.5 km/s and 22 km/s. Relative to Earth and using Earth's average, that's 3.3 km/s when Mars is at perihelion and 8.2 km/s...

NASA considers an early return of Crew-11 due to a medical issue with one of the crew members. An earlier spacewalk was delayed for the same reason, too. --> If needed, Crew-11 can return within 24 hours, faster if you are more flexible with landing sites - but landing in the middle of nowhere...

Parachutes don't give you precision, so you can only do an ocean splashdown. That's bad for the engines, and the corrosive salt water is even worse. Refurbishing the Shuttle boosters was about as expensive as building new ones. The landing burn doesn't need that much propellant either - only a...

Long March 12A was launched for its maiden flight. It is designed with a reusable booster. The payload reached orbit, but the booster landing failed. Rumors say that the reentry burn only had two instead of three engines, which made the booster come in really hot. SpaceX makes landing look easy...

Launch failure of H3 on its 7th flight, naturally named F8 (F6 hasn't flown yet). It reached a very low orbit but the upper stage didn't have enough hydrogen left to raise that to the target transfer orbit, so the spacecraft reentered over Chile a few orbits later.

Something happened to a Starlink satellite. Could be a space debris strike or some internal issue. The propellant tank got damaged and some debris items were produced that can be tracked. Luckily it happened at an altitude of just 418 km (the satellite was only launched last month), so...

No website that accepts this is worth a recommendation. You are not the first who thinks they can revolutionize physics based on some popular science descriptions and (more recently) AI tools praising everything you feed them. If you had the required knowledge to contribute anything useful, you...

Successful maiden flight for Zhuque-3. The attempted booster landing failed. Looks like an issue during the landing burn, so there is a good chance the next attempt will succeed. Booster reuse will become standard, and companies that don't work on it fall behind.

8 spacecraft are docked to the ISS for the first time Soyuz MS-27 (outgoing crew) Soyuz MS-28 (new crew) Dragon (Crew-11) and 5 resupply missions (Dragon, HTV-X, Cygnus, 2*Progress), occupying all docking ports of the ISS. This also gives the current ISS the largest pressurized volume of any...