Recent content by mfb

The abort system might do that (with some rounding errors), but the rocket will certainly not. Net acceleration at liftoff is only something like 0.4 g. Fueling of Artemis II has started, 9 hours and 50 minutes to go. I started a thread.

The Artemis program in the US aims to return to the Moon, land, and work on long-term expeditions and a permanent Moon base. At least for initial missions, astronauts will launch in an Orion capsule on top of the Space Launch System (SLS), and return in Orion. SLS and Orion made a first uncrewed...

L-42 hours. Orion should be powered up at this point, the rocket stages will follow shortly. Still on track for an April 1 launch, but with the option to launch at a later date if needed. https://www.nasa.gov/general/nasa-releases-artemis-ii-moon-mission-launch-countdown/...

With your assumptions, the acceleration due to gas (or gas+dust, a 1% effect isn't important here) is ##\frac{v^2\rho A}{m} = 7\cdot 10^{-16} \frac{m}{s^2}##. Over 100 years such an acceleration leads to a displacement of 3.5 km, over 1000 years it leads to a displacement of 350 km along its...

[Fincke] suddenly couldn’t speak in space. NASA astronaut says his medical scare remains a mystery Artemis II is still on track for a Wednesday, April 1 launch (in 4 days and ~23 hours, live countdown). The weather forecast looks promising and the crew moved to the launch site.

Ignition: NASA's Plan for The Moon 1 hour press conference with Artemis updates. Gateway is paused. Neither SpaceX nor Blue Origin like NRHO (the distant Moon orbit that is a detour for landing on the surface), NASA considers alternatives. There are a couple of proposals. As an example...

Artemis II is expected to roll back to the launch pad on Thursday or Friday. NASA aims at an April 1 launch, but every day until April 6 is available. The April launch windows are in the evening local time. I found this image from the Crew-12 launch in February (higher resolution versions here):

Gateway's status is unclear at the moment. Firefly's Alpha rocket is back. After a launch failure last April, they reached orbit with a test flight - the third full success in 7 flights (2 failed to reach orbit, 2 reached a lower orbit). Russia fixed its damaged launch pad, the next mission...

Are you sure you have suitable velocities for these particles? If they are way too fast, they'll spread out like a sphere.

Every major browser has some spellchecking that can be enabled. Usually you can add new words to the dictionary, too (try right-click -> "add to dictionary" or similar). That's great for some technical words and other things that you might use repeatedly and don't want to see highlighted.

Isaacman has been busy. Besides the updates above, here is a 1 hour press conference on the future of Artemis News coverage For Artemis II, they'll have to inspect helium tanks, replace batteries of the flight termination system (FTS), and work more on leaks. To be determined how long that...

Seeing something is easier if the surface has sunlight. You can do infrared measurements either way, but there is no visible light without sunlight. Rollback of Artemis II is underway Mike Fincke has revealed that it was him with the "medical event" without saying what it was. Edit: Expected...

Doesn't look so good for Artemis. This is something they discovered after the WDR. If they roll it back, we are looking at the April launch windows the earliest.

The Artemis WDR was successful, it reached the planned T-29s. There were some holds to address issues in between but all of them has been resolved fast enough - if this had been a launch attempt, it could have proceeded to launch. Edit: NASA now aims at a launch on March 6 (March 7 by UTC)...

Yes, they want the far side to be in sunlight when they fly over it. Fueling for WDR 2 is ongoing