Why does space look dark? -Scientific Exploration- cnBeta.COM

July 1, Beijing time, if you look up at the night sky or marvel at the beautiful photos of the universe on the internet, you will find that there is not much difference between the two: the two are dark and deep, bright stars, planets or spacecraft. Have you ever wondered why the universe is so dark? Why is the universe as colorless as the daytime blue sky on Earth?

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The darkness of the universe has nothing to do with the lack of light.

Tengley Hutchinson-Smith, a graduate student in astronomy and astronomy at the University of California, Santa Cruz, explained: “Because there are countless stars in our galaxy and countless galaxies in the universe, you think there are countless other objects. Reflect light such as planets. Then when you look at the night sky the whole night sky should be very bright. However, in reality, the universe is very dark. “

Hutchinson-Smith said that this contradiction is called the “Obers paradox” in physics and astronomy circles. This can be explained by space-time expansion theory, which means that “the speed of expansion of our universe exceeds the speed of light … പ്രകാശ The light from distant galaxies can not be detected by our naked eyes as infrared, microwave, and radio waves.”

Miranda Upper is a graduate student in astronomy and astronomy at the University of California, Santa Cruz. She agrees with Hutchinson-Smith. She said: “Even colors that are invisible to the human eye, such as ultraviolet or infrared, can emit different colors of light. If our eyes could see the microwave, we could see the whole universe glowing.” The cosmic microwave background still fills the entire space. (The universe’s oldest light, the cosmic microwave background, came from the Big Bang, scattering protons and electrons that existed in the early universe.)

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Another reason for the darkness between the interstellar and interplanetary is that the space of the universe is almost empty. Remember that the earth’s sky is blue, because the molecules that make up the atmosphere (including nitrogen and oxygen) scatter blue and violet light in all directions, including ours, in short wavelengths of sunlight. Scattering from the direction of the eye. However, without these substances, after emitting light from its light source, it travels in a straight line until it is received. Since space is almost empty, this means that there are no such particles in space, and there is no substance that can scatter light between stars and planets and enter our eyes. Since no light enters our eyes, what our eyes see is naturally a part of the black hole.

However, a study published in 2021 found that the universe may not be as dark as scientists first thought. Based on NASA’s New Horizons mission to explore Pluto and the Kuiper Belt, researchers can already observe space without interfering with Earth’s light or the sun. The research team displayed photos taken by New Horizons, which reduce all light from known stars, galaxies, and possible galaxies to any light coming from the camera. Finally, they found that the background light of the universe was twice as bright as predicted.

It is clearer than we can imagine why the universe is still an unsolved mystery, and it will be the focus of future research. But until then we can say this: the universe is darker than pitch black.

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