User talk:124.63.138.20

Hello. The lander failed to land, not just to communicate. Please see this report on its KNOWN speed just before impact:. There is no doubt the lander failed to land, the question is nature of that failure. Cheers, Rowan Forest (talk) 18:32, 7 September 2019 (UTC)


 * https://www.isro.gov.in/chandrayaan2-latest-updates Please verify isro most letest update to edit.It was only signal failured.The investigation under process. Please update like your previous edits...."Landing failed"....word crash is wrong — Preceding unsigned comment added by 124.63.138.20 (talk) 18:31, 7 September 2019 (UTC)


 * Hello and thank you for talking. There are 2 key factors in this: physics and national pride. (1) ISRO will  NEVER  release a statement using the "crash" word, even after images of the impact crater are released (just watch). The Prime Minister has Tweeted alternative wordings to "crash", such as "set back", and "proud of a programme that had come so near to putting a probe on the Moon". (2) Regarding the physics, once a lander's orbit speed is reduced, gravity takes over (fact) and a crash will happen (fact)....unless the onboard propulsion performs a very precise sequence of events so it can change all that and soft-land. The sequence was interrupted as evidenced by the trajectory and speed seen live, so a crash must have happened.  For Wikipedia purposes, I think we can quote the reputable publications dedicated to space missions, such as Space, where they state "apparent lander crash" .  Also, this MIT report states that the telemetry shown live on TV showed that the lander was not just off course, but falling too fast in its final seconds: .  If you hope that the lander landed safely but it is silent, it is false hope, and there are no references to support that scenario.  Cheers, Rowan Forest (talk) 18:37, 7 September 2019 (UTC)


 * So, when the lander was at 330 m altitude, it was off course and falling (no final burn) at 58 meters per second (209 km/hour), and it certainly "failed" but it did not "crash". Maybe during the 5.6 seconds left, it dug a tunnel to the other side of the Moon? Or maybe it bounced back to orbit? Just curious, inquiring minds want to know. Rowan Forest (talk) 18:55, 7 September 2019 (UTC)