Why astronauts see black sky

Surprisingly, the answer has little to do with a lack of light. "You would think that since there are billions of stars in our galaxy, billions of galaxies in the universe and other objects, such as planets, that reflect light, that when we look up at the sky at night, it would be extremely bright," Tenley Hutchinson-Smith, a graduate student of astronomy and astrophysics at the University of California, Santa Cruz (UCSC), told Live Science in an email. "But instead, it's actually really dark." Hutchinson-Smith said this contradiction, known in physics and astronomy circles as Olbers' paradox, can be explained by the theory of space-time expansion— the idea that "because our universe is expanding faster than the speed of light … the light from distant galaxies might be stretching and turning into infrared waves, microwaves and radio waves, which are not detectable by our human eyes." And because they are undetectable, they appear dark (black) to the naked eye. Miranda Apfel, who is also a graduate student of astronomy and astrophysics at UCSC, agreed with Hutchinson-Smith. "Stars give off light in all colors, even colors not visible to the human eye, like ultraviolet or infrared," she told Live Science. "If we could see microwaves, all of space would glow." Apfel said this is because the cosmic microwave background — light energy from the Another reason interstellar and interplanetary space appear dark is that space is a nearly perfect vacuum. Recall that Earth's sky is bl...

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Why does space appear black to an astronaut? We all want to witness the universe beyond just the planet we live on. From earth whatever we see outside is the minutest fraction of what actually lies in the great beyond. However, we have been grateful enough to see so many pictures and videos of what space actually looks like. And few lucky people, or to be precise, highly trained people have even gotten the honor of traveling there. One of the major differences we notice is in how the view above looks to us and looks to astronauts in space. Why is the sky blue on Earth? To us on Earth, the sky looks like a wonderful shade of blue. Sometimes the colors may differ but the color we mostly witness is blue, as we have aptly named sky blue. Let us first understand why we on this planet witness the sky as blue. When sunlight reaches the Earth's atmosphere, it is scattered in all directions by all the gases and particles in the air. Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than the rest of the colors as it travels in shorter, smaller waves as compared to the other colors. This is why we see a blue sky most of the time. What happens closer to the horizon? Closer to the horizon, the sky fades to a lighter blue or white. The sunlight reaching us from low in the sky has passed through even more air than the sunlight reaching us from overhead. As the sunlight has passed through all this air, the air molecules ha...

The sky appears blue, when viewed from Earth, because of the scattering of the light. Scattering is the phenomenon by which a beam of light is redirected in many different directions when it interacts with a particle of matter. When sunlight strikes molecules in our atmosphere, the light is redirected in many directions. The blue light is scattered more than the red light causing the sky to be blue. In the space, there is no atmosphere. So, light will not scatter in space. This is the cause of dark sky when viewed from space by astronauts Question Description Why astronaut see black? for Class 10 2023 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about Why astronaut see black? covers all topics & solutions for Class 10 2023 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Why astronaut see black?. Here you can find the meaning of Why astronaut see black? defined & explained in the simplest way possible. Besides giving the explanation of Why astronaut see black?, a detailed solution for Why astronaut see black? has been provided alongside types of Why astronaut see black? theory, EduRev gives you an ample number of questions to practice Why astronaut see black? tests, examples and also practice Class 10 tests.

Why do astronauts in orbit around Earth see a black sky with stars that do not twinkle but see a blue earth? Stars twinkle due to the scattering effect of earth's atmosphere. In space this is no atmosphere, thus they do not twinkle. The sky is black in space because there is no scattering of light as there is in the atmosphere. The earth appears blue from space due to the color of the gases in the atmosphere, and their reflected light on large bodies of water.

Authors • Hannah Schunker Lecturer of Physics, University of Newcastle • David Pontin Associate Professor of Physics, University of Newcastle Disclosure statement The authors do not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment. Partners Why do we see the sky during the day, but the galaxy at night? — Gary, age 9, Auckland Hi Gary! Thank you for this great question. To put it simply, the reason the sky looks different to us between daytime and nighttime is mostly because of our atmosphere. The atmosphere surrounds Earth, and extends from the ground to outer space. It’s made of different gases including oxygen (which keeps us alive as we breathe it in), carbon dioxide (which we breathe out), methane (which is also in our farts), nitrogen and argon. All these gases, as well as all solids and liquids, are made of molecules. Molecules are collections of atoms which are much too small for us to see, but are the basic building blocks of everything that exists. Importantly, different molecules have different combinations of atoms and come in different sizes. A molecule’s size plays a role in how the molecule interacts with light. Light from the Sun isn’t one colour — it’s made up of all the colours of the rainbow (which is why we see a rainbow when light behaves in a certain way). Some of the molecules in Earth’s atmosphere are...

Several times over the past month I’ve seen people in the comments section here asking why stars aren’t visible in photos taken from the International Space Station, from the space shuttle, or from lunar satellites. This objection is one of the prime issues raised by people who claim to believe the original moon landings were […] Several times over the past month I've seen people in the comments section here asking why stars aren't visible in photos taken from the International Space Station, from the space shuttle, or from lunar satellites. This objection is one of the prime issues raised by people who claim to believe the original moon landings were hoaxes. But put that aside – it's a valid question, and remains a puzzling one for many who are unfamiliar with the details. The answer turns out to be simple. On Earth we're used to seeing stars brilliantly dot the nighttime sky, and in space, the sky always appears black as night. But the analogy turns out not to hold. Our daytime sky is bright because of the diffusion of light through the atmosphere. In space, or on the moon, there's no atmosphere to spread the light around, and the sky will appear black at midday – but that doesn't mean it's not just as bright. An astronaut looking out the window of the space station will see just as much direct sunlight, if not more, than I will looking out my apartment window on a cloudless day. If I want to take a picture out my sunny window, I'll naturally use a fast exposure and a na...

Several times over the past month I’ve seen people in the comments section here asking why stars aren’t visible in photos taken from the International Space Station, from the space shuttle, or from lunar satellites. This objection is one of the prime issues raised by people who claim to believe the original moon landings were […] Several times over the past month I've seen people in the comments section here asking why stars aren't visible in photos taken from the International Space Station, from the space shuttle, or from lunar satellites. This objection is one of the prime issues raised by people who claim to believe the original moon landings were hoaxes. But put that aside – it's a valid question, and remains a puzzling one for many who are unfamiliar with the details. The answer turns out to be simple. On Earth we're used to seeing stars brilliantly dot the nighttime sky, and in space, the sky always appears black as night. But the analogy turns out not to hold. Our daytime sky is bright because of the diffusion of light through the atmosphere. In space, or on the moon, there's no atmosphere to spread the light around, and the sky will appear black at midday – but that doesn't mean it's not just as bright. An astronaut looking out the window of the space station will see just as much direct sunlight, if not more, than I will looking out my apartment window on a cloudless day. If I want to take a picture out my sunny window, I'll naturally use a fast exposure and a na...

Why do astronauts in orbit around Earth see a black sky with stars that do not twinkle but see a blue earth? Stars twinkle due to the scattering effect of earth's atmosphere. In space this is no atmosphere, thus they do not twinkle. The sky is black in space because there is no scattering of light as there is in the atmosphere. The earth appears blue from space due to the color of the gases in the atmosphere, and their reflected light on large bodies of water.

Authors • Hannah Schunker Lecturer of Physics, University of Newcastle • David Pontin Associate Professor of Physics, University of Newcastle Disclosure statement The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment. Partners Why do we see the sky during the day, but the galaxy at night? — Gary, age 9, Auckland Hi Gary! Thank you for this great question. To put it simply, the reason the sky looks different to us between daytime and nighttime is mostly because of our atmosphere. The atmosphere surrounds Earth, and extends from the ground to outer space. It’s made of different gases including oxygen (which keeps us alive as we breathe it in), carbon dioxide (which we breathe out), methane (which is also in our farts), nitrogen and argon. All these gases, as well as all solids and liquids, are made of molecules. Molecules are collections of atoms which are much too small for us to see, but are the basic building blocks of everything that exists. Importantly, different molecules have different combinations of atoms and come in different sizes. A molecule’s size plays a role in how the molecule interacts with light. Light from the Sun isn’t one colour — it’s made up of all the colours of the rainbow (which is why we see a rainbow when light behaves in a certain way). Some of the molecules in Earth’s atmosphere are...