Why was Hubble able to photograph the universe 13 billion years ago?

For example, it takes 8 minutes for the light from the sun to reach our earth, and the light I see now actually came out of the sun 8 minutes ago, in other words, the sun I see is the sun 8 minutes ago, and the same is true for other galaxies. If we look at tens of billions of light-years away from us (the time it takes for light to travel in a year, in units of distance), and the light that enters our eyes also takes tens of billions of years to enter our eyes, at this time, we see the past.

You misunderstood this. The Hubble Space Telescope calculates the age of the universe based on the microwave background radiation produced when the universe is large. If you measure it 4.5 billion years ago, the age of the universe is 4.5 billion years younger.

First of all, I think your main problem is that you have reversed the process of seeing with a telescope, you think it is coming from a telescope, you say that it is light, or sight... Walk, walk, walk, walk, walk in front of the stars, we only see the stars... In fact, the light from the stars is running towards our side of the earth and appears on the telescope.

Secondly, some of the stars are too far away from us, and we see them as they used to be, and what they look like after that will have to wait for the light to come later. For example, at 12:00 p.m., the sun suddenly doesn't light up for a day, and at this time it's 12:00

00 We are still basking in the sun on earth. Wait until 12:08:

20 The picture of the sun not shining can be displayed in front of us. Finally, I would like to say that the way to measure the distance of a celestial body is to use the second gap, Cepheid variables, or some other method, because the light-year unit is still a very short unit of measurement in astronomical terms. It's the same as you have to measure the distance from Beijing to Shanghai in mm.

This is called a temporal cone. The celestial bodies we see are images from years ago. The distance is how many light years, and what you see is how many years ago.

And the distance of the celestial bodies is different, so the sky we see is not the same time sky, right? For example, the Andromeda extragalactic galaxy M31 is tilted towards us, and its length is about 100,000 light-years, so the image we see of the extra-andromeda galactic galaxy M31 itself contains information tens of thousands of years apart.

I'm going to find the information myself.

The fact that Yuchang has not explored the boundary so far shows that the universe is a very vast space. Maybe it's because the universe is a huge creature, or maybe it's because Zheng Jie is a space that is wrapped in it, so there is such a big place.

The universe is quite large, because the universe is boundless, it contains a lot of matter, there are many stars, so the universe is boundless.

The universe is very large, and this is because the universe is constantly expanding, and after the Big Bang, the universe is constantly expanding outward.

This view of the Milky Way, made up of thousands of individual observations taken by the Hubble Space Telescope, is the most detailed image of the universe to date. NASA, ESA, and the University of California, Santa Cruz), the University of Connecticut), the University of Leiden), the University of Geneva), and scientists from the Hubble Heritage Research Group (KDSP) have created a new family for the universe**. Unlike the ** in your family photo album, this panorama of galactic history contains ancient galaxies and babies, established worlds, and the inevitable – occasional train wreck.

kdspe" "kdsps", new images released on May 2, are called "Hubble Heritage Fields". Stitching together more than 7,500 observations from the Hubble Space Telescope over 16 years. The final composite image contains about 265,000 galaxies, many so far away that their light has spent billions of years satisfying Hubble's gaze, Garth Illingworth, an astronomer at the University of California, Santa Cloud and principal investigator of the project, said in a statement

Since then, Hubble has been making tens of thousands of hours of observation every day, almost thirty years. ”。The telescope has just celebrated its twenty-ninth birthday with an image of this stunning southern crab nebula.

Hubble researchers hope that this new mosaic of galaxies of aliens, combined with the last 16 years of these observations, will inspire other astronomers to uncover the secrets hidden in these worlds. Including the origin of the Milky Way's "train wreckage" – fragments of stars produced when two or more young galaxies collide with each other. (For what it is worth, the Milky Way could be such a train wreck.)

As this ** describes, the depth of field could be exceeded within a decade. Sometime in the mid-20s of the 20th century, NASA wanted to launch a new eye in the sky, called the Wide Field Infrared Measurement Telescope (WFIRST). If all goes according to plan, every ** shot by Wfirst will capture a 100x view of a typical Hubble image.

Expect a new cosmic family**, showcasing tens of millions of distant galaxies side by side. "KDSPE" 15 memorable images of stars, 12 of the strangest objects in the universe, 9 scientific excuses for why we have not yet encountered aliens, and KDSPS was originally published in Living Science.