Does light travel through space?

My telescope, established for astronomy in my light polluted San Diego backyard, was indicated in a galaxy away from the earth. My wife, Christina, went as the first space photo for my tablet. It jumped on the screen in front of us.

“he is Pinwheel galaxy“I said. This name is taken from its shape -even though this pinwheel has a trillion stars.

Prakash from Pinwheel traveled in the universe for 25 million years – a distance of about 150 quintalian miles – to reach my telescope.

My wife surprised: “Light does not get tired during such a long journey?”

Her curiosity triggered a thought-respective conversation about Prakash. Finally, why does light not wear energy over time and lose energy?

Let’s talk about light

I one AstronomyAnd one of the first things that I learned in my studies is that light often behaves in ways that reflect our intuition. Is light electromagnetic radiation: Originally, an electric wave and a magnetic wave together and travel through travel space timeit There is no massThis point is important because the mass of an object, whether a specs of dust or a spacecraft, limits the top speed that he can travel through the space.

But because the light is largely capable of reaching the maximum speed range in a vacuum – about 186,000 miles (300,000 km) per second, or About 6 trillion miles per year (9.6 trillion kilometers). There is nothing sharp to travel through space. To keep in that perspective: At that time takes you to nap your eyes, a particle of light travels more than twice around the circumference of the Earth.

The space is incredibly stretched, incredibly stretched. Sunlight from the sun, which is 93 million miles (about 150 million kilometers) from the Earth, the bus is over To reach us for eight minutesIn other words, the sunlight you see is eight minutes old. Alpha saintAfter the sun, the nearest star for us is 26 trillion miles (about 41 trillion kilometers). So as long as you see it in the night sky, its light is more than four years old. Or, as astronomers say, it is Four light years away,

Keeping those huge distances in mind, consider Christina’s question: How can light travel throughout the universe and not lose energy slowly?

Actually, some light loses energy. This happens when It stops somethingSuch as the intersteller dust, and scattered about it. But most of the light bus goes and goes, without colliding with anything. This is almost always the case because Space is mostly empty-Nothingness. So there is nothing on the way. When the journey of light becomes unaffected, it does not lose any energy. This can maintain the speed of that 186,000 miles-sequence forever.

It’s about time

Here is another concept: portray yourself as an astronaut Rider at International Space StationYou are orbiting at a speed of 17,000 miles (about 27,000 km) per hour. In comparison with someone on Earth, your wrist clock will stand 0.01 seconds a year.

An example of this is time dilation-Ast is running Different speeds under different circumstancesIf you are really moving faster, or close to a large gravitational field, your watch will be more slowly than someone, which runs slower than you, or which is ahead of a large gravitational field. to say that, Time is relative,

Now consider that there is light Over time connectedPicture is sitting on one PhotonA fundamental particle of light; Here, you will experience maximum time spread. Everyone on Earth will make you watch you at the speed of light, but with your reference frame, the time will stop completely.

This is because the time to measure “watches” is running at a very different speed at two different places: the photon is moving at the speed of light, and the Earth moving around the sun is comparatively slow.

What is more, when you are traveling at the speed of light, the distance between where you are and where you’re going decreases. That is, the more compact in the direction of space motion itself becomes more compact – so the faster you can go, the lower your journey. In other words, for photons, Space is squeezed,

Which brings us back to my picture of Pinwheel Galaxy. From the photon’s point of view, a star inside the galaxy emitted it, and then a single pixel in my backyard camera absorbed it, at the same time. Because the space is squeezed, traveling to photons was infinitely sharp and infinitely small, a small fraction of a second.

But from our point of view on Earth, Photon left the galaxy 25 million years ago and traveled 25 million light years in space until it landed on my tablet in my backyard.

And there, on the night of a cool spring, its amazing image inspired a delightful conversation between a dull scientist and his curious wife.

Jard RobertsProject scientist, California University, San DiegoThis article has been reinstated Conversation Under a Creative Commons License. read the Original article,