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A Driverless Car in China Hit a Pedestrian. Social Media Users Are Siding With the Car
  • While I do agree that there are scenarios that are very complicated, I feel like this website does a very poor job at showing those. Almost every single scenario they show doesn't make sense at all. Why are there barriers on one side of the road, why does half the crosswalk have a red light while the other half has a green light?

  • Japan’s ‘moon sniper’ probe made incredibly accurate landing, but is now upside down
  • Fair enough. I've just been jaded from reading people bash on SpaceX anytime anything in space "fails". But yeah, those events are similar in the sense that on the surface it looks like a failure, but they met their main mission goal and learned a lot from it. It sounds like the engine issue might've happened for them before, so hopefully they got a lot of good data from this and are able to fix the issue.

    It's important to keep in mind that going to space is very hard. Landing on another celestial body is order of magnitudes harder.

  • Japan’s ‘moon sniper’ probe made incredibly accurate landing, but is now upside down
  • I don't know why people insist on trying to diss SpaceX anytime there's space news... Anyway, last time they missed the Autonomous Drone Ship was years ago when they were first trying to land. So I'm not exactly sure what you are referring to.

    Plus, with space missions there are usually many different mission objectives, and with this mission the main mission was to "demonstrate its highly precise navigation and landing system" which they determined to be a success. The extra credit mission would be if it landed properly and they were able to do more science with it.

  • Elon Musk’s SpaceX rocket explodes in second test flight | CNN
  • What? 😂 This flight wasn't supposed to go to the moon. It's a test flight. They're developing the most powerful rocket to have ever flown and recover every part of it. They're also using a power cycle for the engine that has never been used before. So no, what SpaceX is doing has never been done before.

  • Elon Musk’s SpaceX rocket explodes in second test flight | CNN
  • A reused rocket mission from SpaceX is at least an order of magnitude cheaper than any other major launch provider. And to this date SpaceX has flown 216 reused rockets, and at least one of those was used for a manned mission.

  • Elon Musk’s SpaceX rocket explodes in second test flight | CNN
  • There's only 8 (or 9 depending on who you ask) planets in the solar system. So Musk would have 2 fingers to spare. And we haven't even "landed" on all of them (not sure how you'd land on a gas giant...)

  • Elon Musk’s SpaceX rocket explodes in second test flight | CNN
  • Also to make it clear, it was never planned to even make it to LEO. SpaceX has made it very clear that they wanted to get close to the energy experienced during an actual reentry without actually making it to orbit.

  • Elon Musk’s SpaceX rocket explodes in second test flight | CNN
  • You do realize that most of the money NASA has given SpaceX has been in the form of contracts to launch missions for them? I'm pretty sure very minimal tax dollars are going to Starship development right now, especially compared to other launch providers (ULA, Blue Origin, ect.) It's because of SpaceX that America is able to launch Astronauts to space without using Russia since the Space Shuttle was retired.

  • Elon Musk’s SpaceX rocket explodes in second test flight | CNN
  • The fastest turnaround time for a space shuttle was 54 days pre Challenger disaster and 88 days post Challenger disaster. It was very expensive and time consuming to reuse the space shuttle (they basically had to completely disassemble and reassemble the whole thing) which is one of the main reasons it has stopped flying. Falcon 9 on the other hand has a fastest turnaround time of 3 weeks. So not sure where you got your numbers from, but it seems to me that the Falcon 9 is a much better vehicle in terms of reuse.

  • What’s something on your mind lately that nobody else would understand?
  • If you understand gravity wells, think of L1/L2/L3 as the shape of a saddle. If you're right in the middle of the saddle it's a pretty stable orbit, but if you get too close to any of the edges you fall right out of it. L4 and L5 are like the peaks of a mountain.

    Also worth pointing out that only L4 and L5 are stable, L1/L2/L3 are only metastable where they require a bit of maintenance to stay there.

    Another fun fact about Legrange Points: There's a group of asteroids called the Trojan Asteroids. There's technically two groups of these since they're stuck in L4 and L5 in the Sun/Jupiter system.

  • What’s something on your mind lately that nobody else would understand?
  • This. There's 5 Legrange Points for every 2 body system. They're specific points around the 2 bodys where the gravity "cancels out". In this case the 2 body system is the Earth and the Sun. JWST is sitting a million miles from Earth at L2.

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    Balex @lemmy.world
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