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Cake day: July 20th, 2023

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  • It’s not a rescue mission. It was an already scheduled mission which is why it’s 6 months long. Two of the originally scheduled crew got their seats bumped so the boeing capsule test asteonauts would have seats for a normal return. Wilmore and Wiliams could have returned in the other spacex capsule that was already up there in case of emergency. They were never stranded.


  • The bad flooding is because of how steep those areas are. Down in Florida, water takes a while to make its way into the creeks, streams, and rivers. The areas with the most extreme flooding is because entire mountainsides worth of rainfall drains in the span of a couple days.

    Eastern TN and western NC also had a ton of rainfall from thunderstorms just before Helene so the ground was already saturated. For reference check out this rain gauge in Asheville.

    https://waterdata.usgs.gov/monitoring-location/353312082355545/#parameterCode=00045&period=P7D&showMedian=false

    The rain from Helene didn’t really get to Western NC until the early hours of Friday the 27th. That gauge was already at 10 inches by that time. So really the storm before Helene brought more rain than Helene did. Either the thunderstorm or Helene alone would have been moderate, but manageable flash floods, but the two back to back was insane.


  • Black holes don’t swallow everything around them for the same reason that the sun hasn’t swallowed all the planets. Outside of the event horizon, gravity still works normally and the fact that it’s a singularity doesn’t really matter. Gravitational capture usually involves multiple objects, because the trajectory has to get nudged for a collision to happen. A gaseous body collects mass at a faster rate than a black hole with the same mass.















  • https://www.planetary.org/articles/why-international-space-station-cant-operate-forever

    The ISS has gone through multiple reboosts to gain altitude because there is a small amount of atmospheric drag in its orbit. That’s not the limiting factor though.

    The structure is aluminum. Aluminum accumulates fatigue damage every time it flexes. Every time the iss goes from sunlight to the earths shadow, there is significant thermal expansion/contraction. This fatigues the structure. The repeated docking maneuvers also stress the structure. Radiation and atomic oxygen also cause degredation. All those factors are relatively minor in any given year, but are always accumulating. The ISS is getting less safe and the risk of a structural failure is increasing.

    On top of that all, a bunch of the systems on board were designed 30 years ago. There have been major changes in communications, power systems, etc. in the time since the modules were built. Even though new experiments are built all the time, they are still constrained by capabilities of the capsules they operate in. So there are also science advantages to moving to a newer platform.