As of Monday, I am officially a PILOT! 👩‍✈️🛩️

After three delays due to weather, I finally had my checkride (the final step for getting a pilot license, which consists of an oral exam and a practical test). Here's a picture of me, the examiner, and my certificate after the flight! Me standing outside a build...
Learning to fly has been AMAZING and I'm thrilled I've been able to do it during the pandemic. My flight school (@Fly7B2) has been good about masks etc during lessons & indoors. It's just a hobby for me, but I'm now obsessed with aviation and can't wait to see where it takes me! Me piloting an airplane wit...
For those interested, here's the track log from my checkride. Lots of maneuvers, almost two hours of flying. The examiner was very thorough, as he should be! Flight actually started at Northampton, but I had the GPS off for the first bit for navigation by pilotage/dead reckoning. A track log showing an airp...
By the way, this is the airplane I've been flying. It's a very pretty bird. 😍 (Piper Warrior II, PA 28 161) A photo of a single-engine ...

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More from @AstroKatie

20 Apr
Nice article by @uncertainquark for @exploreplanets about why terraforming Mars is probably a lot harder than you've been led to believe planetary.org/articles/can-w…
The problem with Mars isn't that it's dry, or even that it's cold. The problem is it has very little air and that air is mostly CO2, and is, incidentally, being slowly sheared off by the solar wind (for lack of a magnetic field). Just heating the planet doesn't solve any of that.
There's actually a decent amount of water (as ice) at/near the surface. But even if you made the planet warmer, above what we consider freezing, that ice will turn right into vapor because there's too little air pressure for liquid water to exist. The atmosphere is a challenge.
Read 4 tweets
8 Apr
I want to expand on this a little... it's an issue that makes the POSSIBLE NEW PHYSICS announcement today a bit more complicated/caveat-y...
Both the measurement and the theory prediction for this experiment require INCREDIBLE precision. And the calculations are HARD. You have to account for how every particle known to science might interact with a muon, hypothetically, and exactly how that would affect its motion. 😳
One way to do this calculation is called the "data-driven" approach, which relies on generalizing from other precise measurements. The other is a new approach using supercomputers doing "lattice QCD" -- solving lots of very difficult equations on a very tight grid.
Read 5 tweets
7 Apr
I've been tweeting a bunch of articles and threads about the #gminus2 result -- a possible indication of ✨ NEW PHYSICS ✨ coming from @Fermilab! Check my timeline for details, but I'll give a very brief and simplified summary here...
An experiment at @Fermilab is measuring a property of muons -- subatomic particles similar to electrons, but heavier -- to try to determine if our current understanding of particle physics is correct or not. The experiment hinges on the fact that muons are a tiny bit magnetic 🧲
The "Muon g-2" experiment measures how muons spin around and how that spin wobbles when they're sent around a circular track in the presence of strong magnetic and electric fields. That depends on how the muon spins and its "g-factor", related to its magnetism.
Read 11 tweets
8 Mar
New guidelines from the CDC for what might be okay for fully vaccinated people: cdc.gov/coronavirus/20…

Note: Dr. @RWalensky emphasized during the White House press conference that this is the best guidance RIGHT NOW but may change as conditions change and the science develops.
New CDC guidance:

"Fully vaccinated" (FV) = at least 2 weeks after final vaccine dose

* FV people can hang out in small groups with each other without masks

* FV people can hang out in small groups with LOW RISK unvaccinated people

* Non-essential travel still discouraged
The reason they're not saying fully vaccinated people can "just go out and do whatever" is partly because vaccines aren't 100% effective and partly because being vaccinated might not always prevent you from carrying the disease to others. (This is still being studied.)
Read 4 tweets
5 Mar
This is an amazing optical illusion — caused by atmospheric conditions over the water bending light rays to make it look like the ship is above it. This video has a nice explanation (especially the bit starting around 1:20) . #FataMorgana
The proper term for this is “superior mirage” or “superior looming mirage” but I have seen the term “fata morgana” used for a similar phenomenon also caused by weird kinds of light bending over the ocean.
More on superior mirages from @iansample. theguardian.com/science/2021/m…

Rather than "optical illusion" it might be better to call this an "optics illusion." Your brain is processing visual information correctly, it's just that the light deflection makes that information unreliable!
Read 5 tweets
4 Mar
Here’s a long-ish excerpt from my book where I talk about THE BIG RIP, one possibility for the end of the universe. (More likely is a Heat Death, caused by endless accelerated expansion, which *doesn’t* rip things apart. But a Big Rip would be fun too.) americanscientist.org/article/tearin…
I just saw a clip of Neil deGrasse Tyson on the Late Show saying that the Big Rip is likely coming and that it’s the necessary result of endless accelerated expansion, neither of which is true! So, see above for clarification.
If you’re interested in reading about what cosmologists are discovering now about how the universe might end, check out my book, “The End of Everything (Astrophysically Speaking)”! It’s accessible and comprehensive and has lots of funny footnotes astrokatie.com/book
Read 4 tweets

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