Liuzi just came to New York and took these photos

10 hours of blues every day is awesome

NGC 7635 is formed by the intense stellar wind (a stream of charged particles) from a massive (O- or B-type) star, blowing the gas into a spherical shell. This radiates ultraviolet radiation and ionizes the surrounding hydrogen, producing the emission nebula's light.
M97 is a Sun-like star that has evolved into a late red giant, ejecting its outer layers of gas, leaving behind a hot core that ionizes these gases.
NGC 2359 is centered on a Wolf–Rayet star (an extremely massive star in its late stage). Wolf–Rayet stars have extremely high stellar wind speeds (2000–3000 km/s) and kinetic energy far greater than that of O-type main-sequence stars. Massive stars are violently stripped of their outer layers before they explode as supernovae.

The ritual of walking the glacier
Drinking local whiskey 🧊

After 21 days in Tibet, I captured the most beautiful snow-capped mountain in Tibet at an altitude of 5,500 meters. It's also the most pyramid-like mountain.
Pulaxi Qiong King Peak

As a blogger who travels around the world, today I turned my travel hard drive upside down and picked out 10 of my favorite landscape photos to make a "full screen wallpaper"

After 21 days in Tibet, I captured the most beautiful snow-capped mountain in Tibet at an altitude of 5,500 meters. It's also the most pyramid-like mountain.
Pulaxi Qiong King Peak

When I Stepped into a Real-Life "Three-Body Problem"
Stepping into the Arctic night for the first time, it felt like arriving at the Red Coast Base in "The Three-Body Problem." "Don't answer! Don't answer!"
Camera in hand, I arrived at Svalbard, the polar region. Turning the mountain pass amidst the azure snowfield, I saw a massive 42-meter-diameter steel disc lying across the snowy landscape. It was the EISCAT Svalbard radar: with a 500 MHz frequency band and 1 megawatt pulse power, it beamed electromagnetic waves daily into the sky to detect auroras and ionospheric changes.

After traveling thousands of miles, I finally arrived at the real fairy tale world. These are the pictures of Tromsø taken by me.

What is the difference between traditional cameras and astronomical cameras?
What is an astronomical camera? This oval object may look different from the mass consumer cameras we are familiar with
In fact, ordinary astronomical cameras are not as expensive as imagined. The astronomical camera on the top of my picture is only half the price of the Sony camera below
Specific differences: Traditional SLR/mirrorless cameras are an integrated terminal of "shoot-process-save-view". The body has a built-in shutter or reflective mechanism. After exposure, the data enters the camera immediately. The ISP completes the noise reduction and Bayer color matrix, and the gamma and compression are saved as JPEG or manufacturer RAW. At the same time, it can be directly previewed through the viewfinder output. All controls are completed in the body firmware and button menus, and users hardly deal with the original pixel stream (part of the post-processing has been completed in the machine)
The astronomical camera is a "naked sensor + ADC". It has no mechanical shutter and no color processing circuits, and even the storage medium and screen are omitted. The original pixels are immediately sent to the external computer in an uncompressed data stream after each frame. The file format is a linear file that looks almost completely black to the naked eye.
In addition, the chip can be selected in monochrome version, which is what we often call a black and white astronomical camera (the quantum efficiency can be more than 30% higher than the Bayer array with the same pixel). The color depends entirely on the user shooting channel by channel on the front filter wheel and then superimposing it in the later stage. The frozen camera is equipped with cooling and fans, which can reduce the chip temperature to 30-40 degrees below the environment to reduce thermal noise. The planetary model focuses on high frame rate, which can reach more than 100 frames when cropping ROI. The camera itself does not have an ISP. All noise reduction, alignment, de-mosaicing, color calibration and dynamic stretching are completed in external software such as FireCapture, NINA, and PixInsight. At the same time, it directly cooperates with astronomical accessories such as guide star, filter wheel electric focus adjustment, etc. through the ST-4 or ASCOM port. It is a direct interaction from the original pixel stream.