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Old 06-01-2014, 09:40 AM  
DaFace DaFace is offline
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Space Exploration megathread
Since a number of cool things are happening in space exploration these days, we'll widen the scope of this thread a smidge. Conversation about all things space exploration are welcome, whether it be from NASA, SpaceX, ULA, Blue Origin, or anyone else. Chances are most of the discussion will still be about SpaceX since they love to make things public and fun, but nothing's off limits. I'll eventually get around to modifying the OP to include resources for other companies too, but in the meantime, feel free to post any cool stuff you run across.

Lists of Upcoming Missions



How to Watch a Live Launch


Where to Learn More
Spoiler!


Glossary
Spoiler!
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Old 03-05-2021, 12:26 PM   #4141
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Old 03-05-2021, 03:10 PM   #4142
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This image shows two possible routes (blue and purple) to the fan-shaped deposit of sediments known as a delta for NASA’s Perseverance rover, which landed at the spot marked with a white dot in Mars’ Jezero Crater. The yellow line marks a notional traverse exploring the delta. The base image is from the High Resolution Imaging Experiment (HiRISE) camera aboard NASA’s Mars Reconnaissance Orbiter (MRO).
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Old 03-05-2021, 03:24 PM   #4143
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Reminds me of a Rain Man poll. Purple is my vote. The traverse looks awesome.
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Old 03-05-2021, 03:51 PM   #4144
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reminds me of a Rain Man poll. Purple is my vote. The traverse looks awesome..
I agree, purple. Check out the scenic turnout on the backside!
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Old 03-05-2021, 09:41 PM   #4145
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Purple...
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Old 03-06-2021, 10:49 AM   #4146
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Old 03-08-2021, 08:28 AM   #4147
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It was later stated that the landing burn was at fault, with Chief Designer Elon Musk stating, “Thrust was low despite being commanded high for reasons unknown at present, hence hard touchdown. We’ve never seen this before.”

As such, had all landing legs locked into place, that would not have protected SN10 from a hard landing. “This was way past leg loads. They got squashed hard,” Elon added.

“Next time, min(imum) two engines all the way to the ground and restart engine 3 if engine 1 or 2 have issues,” Elon pointed out.
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Old 03-08-2021, 09:42 AM   #4148
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It was later stated that the landing burn was at fault, with Chief Designer Elon Musk stating, “Thrust was low despite being commanded high for reasons unknown at present, hence hard touchdown. We’ve never seen this before.”

As such, had all landing legs locked into place, that would not have protected SN10 from a hard landing. “This was way past leg loads. They got squashed hard,” Elon added.

“Next time, min(imum) two engines all the way to the ground and restart engine 3 if engine 1 or 2 have issues,” Elon pointed out.
I didn't know they could throttle low enough to use two engines on landing.
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Old 03-08-2021, 10:30 AM   #4149
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I didn't know they could throttle low enough to use two engines on landing.
Sounds like we are going to find out! SN11 is being rolled out soon.
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Old 03-09-2021, 01:04 PM   #4150
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March 9

Falcon 9 • Starlink V1.0-L20

Launch time: 0258 GMT on 10th (9:58 p.m. EST on 9th)

Launch site: SLC-40, Cape Canaveral Space Force Station, Florida
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Old 03-09-2021, 01:13 PM   #4151
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Sweet. A night launch.
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Old 03-09-2021, 07:01 PM   #4152
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Old 03-10-2021, 05:07 PM   #4153
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“SN10 engine was low on thrust due (probably) to partial helium ingestion from fuel header tank. Impact of 10m/s [22 miles per hour] crushed legs & part of skirt,” he tweeted.

A closer look at the landing of SN10 shows it was slightly leaning to one side before exploding.

Musk went on to explain that the helium ingestion was probably the result of a pressurization system that had been added to the methane header tank to fix a problem that occurred in a previous starship prototype, SN8.

“If autogenous pressurization had been used, CH4 bubbles would most likely have reverted to liquid,” he said. “Helium in header was used to prevent ullage collapse from slosh, which happened in prior flight. My fault for approving. Sounded good at the time.”
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Old 03-10-2021, 05:16 PM   #4154
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Old 03-10-2021, 05:18 PM   #4155
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