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19 paź 2023 · Because the galaxies are moving away so fast, the light from their stars is pushed into colors the human eye can’t see. This effect is called the Doppler shift.
16 paź 2023 · An astronomer explains why space looks so dark despite containing 200 billion trillion stars.
In ultraviolet views of the Sun, coronal holes appear as dark splotches. These regions are where the Sun’s magnetic field lines are connected directly to interplanetary space, allowing solar material to escape out in a high-speed stream of solar wind, leaving a dark “hole” near the surface of the Sun.
18 cze 2023 · fact 1: the night sky is dark, which had been known for some time; fact 2: galaxies are moving away from each other, as shown by Hubble’s observations published in 1929
18 paź 2023 · People have been asking why space is dark despite being filled with stars for so long that this question has a special name – Olbers’ paradox. Astronomers estimate that there are about 200 billion trillion stars in the observable universe.
9 paź 2009 · The simplest answer to why the night sky dark requires that you use your imagination to picture our local star – the sun – and its family of planets. The sun’s light pours...
Why is the sky dark at night? You might think the answer is obvious, the sun isn't up. But the only reason the sky looks blue during the day is that sunlight scatters off of the atmosphere. If we didn't have an atmosphere, like on the moon, the sky would always be dark even when the sun is shining. So let's rephrase the question. Why is space dark?
