> Chinese astronomy enthusiast's 'chasing project'
Liu Boyang, a post-1990 astrophysics doctor and astronomy enthusiast, took hundreds of thousands of photos of the China Space Station (CSS) with a self-developed automatic tracking script for optical recognition.
Common methods for shooting celestial bodies are not suitable for taking higher-precision photos of the space station.
Given some of the disadvantages of the current methods, Liu came up with his own plan – writing an automatic tracking script for optical recognition, then manually finding the space station and framing the tracking based on the control of proportional, integral and differential units.
It took a lot of trial and error before Liu finally fixed the bug and verified the function of the program this April.
Starting in April, Liu and his team have been chasing the space station and recorded over 50 configuration changes from Beijing and South China's Hainan province. He captured the Tianzhou-3 cargo spacecraft's separation from its core module, the Shenzhou-14 spacecraft's launch, and the Mengtian Lab Module's docking with the core module, among others.
When asked about his plan for the future, the 32-year-old astronomer said that he had been preparing himself to record the Tianzhou-5 cargo spacecraft and Shenzhou-15 spaceflight, and it would be his lifetime commitment to explore every possibility to show people the sky and help them learn about space and the universe.
> Why you twitch when you sleep
Hypnic jerks — also called sleep starts — are sudden, involuntary muscle contractions you may experience as you are falling asleep.
Hypnic jerks are a type of myoclonus, which is a category of rapid, involuntary muscle movements.
Hiccups are another type of myoclonus.
Hypnic jerks are associated with a rapid heartbeat, quickened breathing, sweat, and sometimes "a peculiar sensory feeling of 'shock' or 'falling into the void' ".
It can also be accompanied by a vivid dream experience or hallucination.
A higher occurrence is reported in people with irregular sleep schedules.
Moreover, when they are particularly frequent and severe, hypnic jerks have been reported as a cause of sleep-onset insomnia.
Researchers do not know for sure what causes hypnic jerks, but they have a few theories.
Hypnic jerks and other types of myoclonus start in the same part of your brain that controls your startle response.
When you fall asleep, researchers suspect that a misfire sometimes occurs between nerves in the reticular brain stem, creating a reaction that leads to a hypnic jerk.
Hypnic jerks can be unsettling, but they’re not dangerous.
In fact, they’re considered a normal part of falling asleep.
Up to 70% of people experience hypnic jerks.
They can be annoying and disrupt the sleep of you or your partner.
While it is possible that a particularly violent jerk could lead to a minor injury, it’s not common.
Hypnic jerks are a normal, albeit unpredictable, part of the experience of falling asleep.
It’s unlikely that you’ll be able to completely eradicate them from your life.
However, you can reduce their frequency and intensity, and improve your sleep at the same time, with a few relatively simple techniques.
Go to bed and wake up at the same time every day, even on weekends.
Make your bedroom as dark and quiet as possible, using blackout curtains or a white noise machine if needed.
Stop using electronics at least one hour before bed.
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