? Why do we see space as dark despite the presence of the sun, and the sun does not illuminate space as it illuminates the Earth
When searching for pictures of outer space, we find it black and dark, and we do not know the reason behind this total darkness in outer space, while on the surface of the Earth we enjoy the sun close to our planet, which provides us with an abundant amount of light that enables us to see everything around us in its wonderful colors during the day and the night comes to The sun goes to illuminate the other half of the planet.
Planet Earth is surrounded by a gaseous envelope called the atmosphere. The atmosphere contains droplets of water and dust particles, in addition to layers of gases. When sunlight collides with these particles, they cause reflection and refraction. The reflected and refracted rays of the sun work to illuminate what surrounds them, enabling us to see The world around us is colorful.
Light travels in a straight line until it collides with something. Outer space contains some gases and cosmic dust, but it does not have an atmosphere that causes light to scatter, and therefore it is dark and opaque. Once light hits an object and bounces off of it, the atmosphere is what allows colors to be seen. In the visible spectrum.
Although there are also stars in space, it is still dark because the universe is expanding and the stars are getting farther away, and the wavelengths of their lights are increasing. As their length increases, their light becomes less visible to us, until it disappears from our sight completely.
The sky, according to this context, expresses the space of the universe as a whole, not just the night on Earth that follows sunset, and we know nothing of the night except darkness. This means that following the process of sweeping matter in space and shrinking the matter of bodies under the influence of its gravity, the sun began to emit light, and it is surprising that It is always visible in the space of the universe, despite the prevalence of the extremely dark night that covers all objects like a cloak covering them from all sides, so that they appear as bright dots on a dark black background.
The day layer (atmosphere) is not more than 200 km thick, and despite its thinness, it blocks the darkness of outer space from us. It is surprising that the interior of the sun itself is dark because it emits invisible radiation such as gamma rays, X-rays, and ultraviolet rays, and that the luminous outer layer The photosphere is the only one capable of sensing invisible internal radiation and emitting it in the form of visible sunlight.
Another reason for the darkness of space despite the presence of the sun and luminous bodies is that space is an almost complete vacuum. As for the Earth’s sky, it appears blue during the day because the particles that make up the atmosphere scatter many of the blue and violet wavelengths that make up the visible light coming from the sun, so the light is scattered everywhere. directione.
However, in the absence of matter and particles that scatter light, in this case the light travels in a straight line and does not spread. Given that space is an almost complete vacuum containing a very small number of particles, there is nothing in space that scatters light, so it appears dark and opaque as we see it.
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