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Sep 8, 2024 · Expose for the Sky. Ideally, we want to photograph a scene where there is an even distribution of light and dark areas without any detail lost to overly dark shadows or blown highlights. As you probably know, there are three exposure variables — shutter speed, aperture, and ISO. By increasing the shutter speed, lowering the ISO, or decreasing ...
May 3, 2023 · The center of our Milky Way galaxy is hidden from the prying eyes of optical telescopes by clouds of obscuring dust and gas. But in this stunning vista, NASA's Spitzer Space Telescope's infrared cameras penetrate much of the dust, revealing the stars of the crowded galactic center region. NASA, JPL-Caltech, Susan Stolovy (SSC/Caltech) et al.
May 24, 2024 · Plunge into the darker side of the night sky and get to know dark nebulae. Dark nebulae – or absorption nebulae – are clouds of gas and dust in space dense enough to obscure and block light ...
Describe how we can detect interstellar dust; Understand the role and importance of infrared observations in studying dust; Explain the terms extinction and interstellar reddening; Figure 20.9 shows a striking example of what is actually a common sight through large telescopes: a dark region on the sky that appears to be nearly empty of stars ...
Sep 26, 2014 · First is my number one reason that the sky is dark at night simply because it doesn't require us to change the fundamental nature of the universe in order to imagine a universe without it. It is because most of the light from other stars is blocked by dust and gas clouds between us and the other stars. Here's a picture:
Apr 11, 2022 · The “dark rift,” which runs lengthwise down a long part of the Milky Way in our sky and appears to split it in two, is produced by a collection of such obscuring clouds. While dust clouds are too cold to radiate a measurable amount of energy in the visible part of the spectrum, they glow brightly in the infrared (Figure \(\PageIndex{3}\)).
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Why is the sky dark at night?
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What causes a dark rift?
Why does the sky look blue?
A diagram explaining the extinction and reddening of light. Astronomers can calculate how much light is absorbed by dust by looking at the density and depth of a cloud of material. The combination of these two variables is referred to as optical depth. The fraction of light transmitted by a cloud rapidly declines as the optical depth increases.
