With the progress of human science and technology and the improvement of photography, the veil of the solar system is being unveiled layer by layer.

Since the camera was first sent into space in the 1940s, we have taken millions of images of planets of the solar system, satellites, comets and asteroids. From the rough but majestic black-and-white photos of the curvature of the earth to the magnificent and high-resolution color images of Pluto in the distant cold world. We have been able to observe the solar system in unimaginable ways. Although only a few people have seen the earth with their own eyes from space, it doesn't mean that we can't see its prosperity and glory. In the past 70 years, weather balloons, satellites and eventually astronauts have taken thousands of incredible photos of the earth, which not only show the beauty of the earth, but also reveal its fragility.

This photo showing the sunny side of the earth was taken by NASA's EPIC camera, which is connected to NOAA's DSCOVR satellite. EPIC cameras take natural color photos of a million miles away at least every two hours, so that we can observe the earth from human eyes. In 20 16, NASA combined more than 3,000 of these incredible images into a delayed sequence, showing the operation of the earth for more than a year. You will see the ever-changing movement of white clouds, which cover the deserts and forests in the world, and of course, our vast ocean, which has a unique blue color. This is our planet and the earth is so magnificent. Until the middle of the 20th century, our neighbor Venus was considered to have similar surface conditions to the Earth.

It was not until the Soviet Union sent their fleet of Venera detectors to fall from the thick clouds of the planet that we finally caught a glimpse of the true face of Venus. A hellish sight caused by devastating pressure and devastating temperature. This amazing photo was taken by the Soviet spacecraft Venera 13 in 1982, which is one of the first color images ever taken from the surface of Venus. The design of the probe lasted about half an hour, and it could resist the heat and strong atmospheric pressure, but the amazing spacecraft finally lost more than two hours of data after landing. Although these images don't look as amazing as we first saw from the surface of Mars, when you consider the environmental conditions that Venera probes have to endure, they suddenly become incredible. For a little over 10 years, the Solar Dynamics Observatory (SDO) of NASA has been observing the sun and has taken hundreds of millions of high-resolution images.

SDO (Solar Dynamics Observatory of National Aeronautics and Space Administration) captures a new image of the sun from Earth orbit at different wavelengths of 10 every 10 second, allowing us to observe the nearest star in an unprecedented way. By time-lapse shooting, we can capture the large-scale explosion moment of coronal matter on the sun, which will produce violent solar flares and a phenomenon called coronal rain. Shooting video consists of thousands of pictures, and every second in the video is equivalent to about 6 seconds in real life. By comparing with the size of the earth, you can find that the scale of this solar storm is huge, and you can understand the true scale and power of this eruption.

August 20 14, man successfully entered orbit for the first time and landed on the comet "67P/ Churyumov-Gerasimenko". This mysterious comet and this feat have been written into human history. The spacecraft to achieve this incredible comet encounter and landing work is the Rosetta probe of the European Space Agency and its Philae lander. Before that, no one knew what the comet would look like at close range except that we could analyze thousands of magnificent pictures of the mysterious comet. This black-and-white photo was taken when "67P/ Churyumov-Gerasimenko" was close to the sun. The picture shows that a material stream consisting of ice dust sublimation and gas particles is ejected from the broken surface of the comet.

We also took a short but amazing close-up time-lapse photo showing the surface of the comet. The picture shows that the vortex air mass surrounded by ice dust is illuminated by the sun. As the comet rotates, the bright stars in the background also move vertically. When shooting in time delay, the detector is about 13 miles away from the surface of the comet, and the whole process takes about 25 minutes. Jupiter, a giant gas planet, can easily become one of the most magnificent worlds in the solar system. Many spacecraft have visited it for many years. Unfortunately, no detector can capture its magnificent scenery like NASA's Juno spacecraft.

Juno has taken and transmitted countless amazing photos of Jupiter, enabling researchers and space enthusiasts to observe this giant planet at an unprecedented close range and witness its unprecedented complex clouds. Although we may be used to seeing pictures of Jupiter and beautifying them with bright colors such as blue, white and orange in order to highlight the spectacular scene of Jupiter, in fact, this huge planet is much dimmer than the real picture shows. But even so, you can still see the spectacular and chaotic clouds spinning and twisting, just like cream spinning in coffee.

Enceladus, which is small and covered with ice, is one of the strangest satellites orbiting Saturn in the solar system.

This mysterious satellite was photographed by a passing spacecraft, but it was not until the arrival of Cassini that we really got a close look at its frozen and rugged surface. This photo was taken in August, 20 15, and it vividly shows a part of Enceladus passing through Saturn's ring. You can also see the contrast of various terrains, one side is covered with ancient craters, and the other side is quite smooth, which shows that the process of crossing craters is taking place. Although this smooth and tender side has no scars, it winds northward with huge cracks, reminding us how amazing the geological activities of Enceladus are.

This incredible time-lapse photography lasted for 14 hours, revealing that active satellites sprayed ice plumes into space, and confirming that there must be an ocean hidden under the surface of Enceladus. Although we have millions of images of the solar system, we have only explored a small part of them. There are still many places waiting for us to set foot here, and there is a bigger world waiting for us to explore further. But these pictures we collected can really remember how far we have come and how far we need to go.

relevant knowledge

Saturn is the sixth planet from the sun and the second largest planet in the solar system after Jupiter. It is a gas giant planet with an average radius of about 9.5 times that of the earth. [20][2 1] Its average density is only one-eighth of that of the earth, but Saturn's mass is 95 times that of the earth because of its larger size. [22][23][24] Saturn is named after the Roman god of wealth and agriculture, and its astronomical symbol () represents the sickle of God. Before the 2nd century A.D., the Romans named the 7th day of the week Saturday Sāturni diēs ("Saturn's Day").

Saturn's interior is probably a core composed of iron, nickel and rock (silicon oxide). Its core is surrounded by deep metallic hydrogen, and the middle and outermost gas layers are liquid hydrogen and liquid helium. Due to the existence of ammonia crystals in the upper atmosphere, Saturn's appearance is light yellow. The current in the metallic hydrogen layer is thought to be the cause of Saturn's planetary magnetic field, which is weaker than the earth, but because Saturn is bigger, its magnetic moment is 580 times that of the earth. Saturn's magnetic field strength is about one twentieth that of Jupiter [26]. The outer atmosphere is usually mild, because it lacks contrast, so it appears as a long-standing feature. The wind speed on Saturn can reach per hour 1800 km (per hour 1 100 miles; 500 meters per second), higher than Jupiter, but lower than Neptune.