Calling this structure a stack is by analogy to a set of physical items stacked one atop another, such as a stack of plates. Pop, which removes the most recently added element that was not yet removed.Īdditionally, a peek operation can, without modifying the stack, return the value of the last element added.Push, which adds an element to the collection, and.In computer science, a stack is an abstract data type that serves as a collection of elements, with two main operations: The resulting image, already using the colour palette measured from the scan of Cassini’s Carte de la Lune provided by the Library of the Utrecht University, was further processed with Photoshop for adding ripple to the strokes and noise effects to the background, emulating a more realistic finish.Simple representation of a stack runtime with push and pop operations. Line spacing and thickness parameters were optimized to maintain maximum detail of the surface features. This monochromatic image was then used as the input for a script to convert pixel intensities to line thickness, in order to simulate the rendering of an engraved print. "Starting with already calibrated and combined data from the archive, I generated a monochromatic version, and enhanced its detail by using PixInsight, to reveal the fine textures in the brightest areas of the dwarf planet. "When Pluto images came from the New Horizons spacecraft sailing at the confines of the Solar System, I wondered ‘what if Cassini could see this remote new world with his own eyes?’ This work humbly tries to answer that by using image processing techniques on these fantastic, otherworldly images. Such a romantic and captivating artwork, resulting from meticulous observations of the Moon with the instruments available at the time," Sergio says. "I was fascinated when I saw Carte de la Lune by Jean-Dominique Cassini (1625–1712) for the first time. My Jellyfish Nebula image has become a family favourite, and I'm sure one day it will be on my living room wall!" Needless to say, I'll be sticking with mono, and taking my time, to keep the standard high. The image needed very little processing to bring out the contrast and details. On combining with the SHO palette in PixInsight, I was immediately pleased. "On doing the first stack of the H-alpha using APP (Astro Pixel Processor), I was blown away by the detail and knew I was onto something. Once I had enough data, I went through each sub individually and removed any which weren't visually perfect. I had a stretch of clear skies and started with H-alpha, then OIII and finally SII from my garden close to Geneva, Switzerland. The Jellyfish Nebula I shot was only my second attempt at mono. Peter says, "I'd only recently made the switch from OSC (one-shot-colour) to mono, and was quite excited, having seen many stunning SHO images around. This will lay the groundwork for future missions that would then target those planets that have been discovered that are more likely to harbour Earth-like atmospheres." It is due to be launched by 2025 with the objective to answer the question ‘are we alone?’ They will observe stars and their exoplanets by using a technique called transit spectroscopy to get a better understanding of their atmospheric conditions. However, a small satellite space mission co-led by an American Laboratory and NASA flight centre are not going to be dissuaded by the myth they have called it ‘Pandora’. The moral of Pandora’s Box suggests that curiosity could be dangerous, and some things are best left alone. She did so by opening a mystical box given to her by the god Zeus that contained all the evils of humanity. "According to the ancient Greek myth, Pandora brought evil into the world and caused the downfall of humankind. Walking among the ruins is hazardous: there are deep holes in the collapsed concrete floors to avoid. It is on a long-abandoned incomplete beach hotel complex. Derek explains, "The image of Pandora on the wall in this photograph is by ‘Wild Drawing’, also known as ‘WD’, a Balinese artist on the Greek island of Naxos.
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