valcatosi
valcatosi t1_j9z9qz1 wrote
Reply to comment by t3hjs in Euclid space telescope launch scheduled for July — ESA mission to chart a 3D map of the universe, in search of dark matter and dark energy by marketrent
Yeah, that's essentially it. Here's an ESA presentation that goes into a little more detail, since as you've guessed it's slightly more complicated: https://www.esa.int/Enabling_Support/Operations/Libration_point_orbits
valcatosi t1_j9z2ta7 wrote
Reply to comment by augugusto in Euclid space telescope launch scheduled for July — ESA mission to chart a 3D map of the universe, in search of dark matter and dark energy by marketrent
The Lagrange points themselves are (theoretically) literally points. Zero spatial extent. The reason they're useful is that you can enter what's colloquially known as a "halo orbit" around them. Those orbits can be enormous - there's plenty of room for all the telescopes we could ever send.
valcatosi t1_j9x5jzi wrote
Reply to comment by mfb- in After Vulcan comes online, ULA plans to dramatically increase launch cadence by OutlandishnessOk2452
>The second stage of Zhuque-2 uses methalox, too.
You're right, I stand corrected. I'm too used to Chinese rockets using solids.
valcatosi t1_j9vtalm wrote
Reply to comment by Adeldor in After Vulcan comes online, ULA plans to dramatically increase launch cadence by OutlandishnessOk2452
Yet to be proved in what sense? There is no credible failure mode associated with methane being in the tanks when the vehicle makes it to orbit.
valcatosi t1_j9vrace wrote
Reply to comment by Adeldor in After Vulcan comes online, ULA plans to dramatically increase launch cadence by OutlandishnessOk2452
I'm not really sure what the point of tracking "first methalox launch to orbit" is in the first place. Feels like just a No True Scotsman game. I'm excited to see all of these rockets launch but the fuel they use is not a primary reason why I'm excited.
valcatosi t1_j9vkopo wrote
Reply to comment by Adeldor in After Vulcan comes online, ULA plans to dramatically increase launch cadence by OutlandishnessOk2452
This really bugs me. Zhuque-2's methane stage operated nominally and a later unrelated stage failed. That has no bearing on "methane engine to orbit" and only has any possible bearing on "a rocket with some methane in it has a fully nominal mission". If the point is methane fueled to orbit, Vulcan and New Glenn (lol) are not in the running, since their methane stages don't get the vehicles to orbit.
valcatosi t1_j9zgvru wrote
Reply to Can you experience g-force without acceleration? by tenminutes101010
You're not dumb. The only thing you're missing is that acceleration is a change in velocity, not a change in speed.
What does that mean? Picture a car driving down the freeway. The speed is what you see on the dashboard, and the velocity is that plus the direction you're going. Now picture driving around a curve in the freeway. The speed stayed the same, but the velocity changed because you changed direction, and while you were on the curve you felt a sideways force. That force is the result of the acceleration that changed the car's velocity but not its speed.
If that makes sense, now picture a car driving around a circular track. The speed stays the same all the time, but the velocity always changes because the car's direction is always changing. The result is that even though the car isn't speeding up or slowing down, you feel a force - that's acceleration!