At this moment, the global scientific and astronomical communities are eagerly waiting for the arrival of July 12th, because the first color image of the Webb Space Telescope will be officially released on July 12th. It is now 7 It's almost 1 month, and we only have a few days left to see the first color image taken by the Webb Telescope.
At a recent press conference, Thomas Zarbuchen, deputy administrator of NASA's Science Mission Directorate (SMD), publicly revealed: This will be the clearest view of the universe ever, and exoplanets spectrum, the view is very beautiful , so beautiful that it makes people cry.
Although the first color image of the Webb telescope has not yet been made public, the test images have already been released. Zarbuchen compared the Webb telescope test images with the Wide-field Infrared Survey Explorer satellite (WISE) and Spitzer Space Telescope ( SST) images are put together for comparison.
As can be seen from the image, the Webb Telescope (JWST), the Wide-field Infrared Survey Explorer (WISE) and the Spitzer Space Telescope (SST) all took pictures of the same distant galaxy. The result is that the Webb Telescope (JWST) ) image is the clearest, followed by SST and WISE, the worst.
A few months ago, the Webb Telescope (JWST) pointed its lens in the direction of Ursa Major (HD 84406), which is about 2,000 light-years away from the Earth, and took a test image again. The image looks very clear, which illustrates the debugging work. It’s over and it’s time to officially take photos.
According to Zarbuchen, the first color image of the Webb Telescope (JWST) will be the most ultra-deep field image of the universe ever produced, far exceeding the Hubble ultra-deep field image. It is important to know that the Hubble ultra-deep field image includes the 10,000 galaxies in the direction of Fornax , with different ages, colors and distances.
The Hubble ultra-deep field image also shows more than 100 of the oldest galaxies. They are shown in dark red color in the image, which means that these galaxies have existed in the universe for more than 12 billion years. The oldest galaxies can be traced back As of 800 million years after the Big Bang , the history can be said to be very ancient.
The ultra-deep field image of the universe from the Webb Space Telescope (JWST) will include more galaxies, and may even include more than 100,000 galaxies. Now, astronomers are continuing to collect JWST data to generate the highest-definition ever Cosmic images.
The James Webb Space Telescope is the most powerful, complex, and expensive telescope ever built, worth more than 10 billion U.S. dollars. Its diameter reaches 6.5 meters, which is 5 times that of the Hubble Space Telescope. It has the most complex mirror ever built. System, state-of-the-art visor.
NASA engineers spent nearly three months calibrating the 118 gold-plated reflectors of html. It was not until late May this year that the calibration work of the 18 gold-plated reflectors was completed and they began to test focusing on distant galaxies. Several test images mentioned above.
The James Webb Space Telescope operates at the Lagrange L2 point 1.5 million kilometers away. This is one of the five gravitational equilibrium points near the Earth. It is a pity that even if it is so far away from the Earth, it cannot escape being meteoroid The fate of the attack, just a few months after going to the Lagrange L2 point, he was hit by a meteoroid. The
meteoroid hit one of the 8 gold-plated reflectors. Since the meteoroid was only about 2 mm, the gold-plated reflector was not penetrated, but left a mark of about 2 mm, resulting in a complete mirror. Damaged, the 2mm trace of will have a certain impact on the image.
This is also the most serious damage suffered since launch. It has been attacked twice before, but did not suffer any damage. Although the Webb Space Telescope had considered the problem of meteoroid impact at the beginning of its design, it did not expect this. A meteor impact can damage the lens.
Why would a meteoroid with a diameter of only 2 millimeters cause so much damage? This is because the speed of meteoroids is so fast. Some meteoroids fly at speeds exceeding 7.9 kilometers per second. Yes, they fly 7.9 kilometers per second. It is incredibly fast and is many times the speed of a bullet.
Although the Webb Space Telescope is relatively stationary to the earth, it uses the sun as a reference. The Webb Space Telescope flies around the sun at an extremely fast speed, reaching a speed of 29.78 kilometers per second.
If the meteoroid flies relative to the Webb Telescope, the relative speed may exceed 30 kilometers per second. Even a very small meteoroid is a super bullet. Therefore, it is very normal for the mirror of the Webb Space Telescope to be damaged. One thing, also, there are a lot of meteoroids in space.
It is reported that the Webb Space Telescope has begun to observe three comets in the solar system. Each comet comes from a different comet family. One is the Jupiter family comet- Comet Borrell, and the second is a comet. The first main-belt comet is Comet Reid, and the third one is a "target comet of opportunity", such as the interstellar visitor "'Oumuamua ". has interesting and interesting scientific content, please follow the only WeChat public account: interesting exploration
