Looking up at the sky, are you attracted by its unpredictable nature? In the clear blue sky, sparse white clouds hang on it, and occasionally a flock of free-flying birds flies by; if it encounters a rainy day, it will be covered by dark thunderclouds.
We can see beautiful scenery like this every day, but have you ever thought about this question: Are the skies of other celestial bodies in the solar system as unpredictable as the earth? What do their skies look like?
Now I will take you on a journey through the solar system to see what the skies of other planets in the solar system look like.
Mercury
First we came to Mercury, but why is it so dark here? Didn't we come at the right time? Of course not, Mercury is different from the Earth in that it is a planet with almost no atmosphere. Therefore, Mercury's sky has no distinction between day and night and is always pitch black.
Compared with other planets, one big difference in Mercury's sky is that it has a huge sun. Because Mercury is too close to the sun, there is always a huge "fireball" hanging in the sky. The diameter of this huge "fireball" is 2.5 times that of the sun when viewed from the earth.
In the Mercury sky, the brightest thing is actually Venus. From the Earth, we see the night side of Venus, while from Mercury, we see the day side, so Venus is the brightest to the Earth. In addition, when looking at the Earth and the Moon from Mercury, they look like two bright "stars".
However, scientists all regret that the detection of Mercury is very difficult. So far, none of the detectors sent to the solar system have successfully landed on the surface of Mercury. The aerial view of Mercury we see now was actually taken from Mercury's low orbit.
Venus
Venus has a very dense atmosphere, and the sky of Venus is covered by very thick clouds. Even during the day, the sun is almost invisible on the surface of Venus, and of course no stars are visible at night. So Venus is a planet that lacks brightness. Even during the day, the brightness of Venus is about the same as the Earth's dusk brightness.
So far, we have not taken any sky images of Venus, because no detector can work on the surface of Venus for more than 2 hours, and the photos taken by the detector are also on the surface. However, based on knowledge of the composition of Venus' atmosphere, sunlight passing through sulfuric acid clouds should appear greenish to orange.
Moon
Our satellite Moon actually has no atmosphere like Mercury. Therefore, the sky seen from the moon is always dark. At present, we have a lot of exploration of the moon. Judging from the images taken by lunar rovers and astronauts, the sun is too bright during the day on the moon and almost no stars can be seen.
Looking at the universe from the moon, the most beautiful thing should be the blue and white earth. However, when viewed from the moon, the size of the earth seems to be four times that of the sun.
Because the moon is tidally locked, the Earth's position in the lunar sky barely changes, and the Earth cannot be seen from the back of the moon. Just like the waxing and waning of the moon can be seen from the earth, the waxing and waning of the earth can also be seen from the moon. Moreover, its gap is exactly opposite to that of the moon. When you see the crescent on the earth, you can see the "full earth" on the moon.
Mars
Led by the famous "Curiosity" probe, we have taken countless photos of the Martian sky. However, the images taken by the probe's camera are different from those seen by the human eye, and there will be some differences, but we don't know where the difference is, because no one has set foot on Mars yet, and no one has told us what the Martian sky looks like.
However, according to the images taken by the detector, the atmosphere of Mars is very thin and the air is full of dust particles. Because the atmosphere contains a lot of iron oxide dust, the sky shows a unique color - pink or tan, sometimes red. But if you look at the sun on Mars, you will find that the sun is blue like the surrounding sky.
Mars has two satellites, namely "Phobos" and "Mammoth". Although these two satellites are very small, they can be clearly seen from the surface of Mars. They are brighter than any planet.
Jupiter
No detector has captured images of the sky within Jupiter's atmosphere, but we already have a lot of information about Jupiter, so we can probably imagine what the sky on Jupiter will look like.
It is speculated that the upper atmosphere of Jupiter is a vast blue, but slightly darker than the blue of the Earth. That is because Jupiter receives less sunlight than the Earth. The deeper you go into Jupiter, the more the sun becomes covered in clouds of blue, brown, red and other colors.
But here you can clearly see the satellites of Jupiter, especially the large satellites such as Io, Europa , Ganymede , Callisto . The largest and brightest satellite is Io, the closest satellite to Jupiter.
In addition, among the 4 Galileo satellites , only Callister can become a "full moon". The reason is that the remaining three satellites are all located very close to Jupiter and orbit the equatorial plane, so they are always in Jupiter's shadow.
In the sky of Jupiter, we can see all the planets except Neptune , the brightest of which are Saturn and Venus.
Saturn
Judging from the images taken by "Cassini" , in the upper atmosphere of Saturn, the sky is blue, and as you go downwards, the sky gradually turns yellow.
There is a famous ring on Saturn. Except for the area below the equator, Saturn's ring can be clearly observed in other places on the earth. This is because the rotation plane of Saturn's ring is consistent with the equator of Saturn, and the ring itself is also a very thin layer. There are many "moons" in Saturn's sky. The particularly bright ones are Titan, Rhea, Dionysus, Thetis, Enceladus and Triton.
From the perspective of Saturn, these moons appear larger than the sun, so "solar eclipses" often occur on Saturn. Other moons, although dimmer and smaller, appear brighter than the star in Saturn's sky.
Of particular note is Saturn's famous satellite Titan. Titan is the only satellite in the solar system with a strong atmosphere. Titan's atmosphere is very dense, and its main components are methane and nitrogen .
The color of Saturn's sky changes according to altitude. It is blue at high altitudes, yellow at mid-altitudes, and vermilion from the surface. Due to the thick clouds, Saturn is almost impossible to see from Titan's surface, and only a bright spot is visible from the Sun. Seen from Titan, Saturn is dimmer than Earth at dusk.
Uranus
The sky of Uranus is blue. We can clearly see from the picture that although this planet has rings, it is generally invisible because it is too dark and thin.
Observing the universe from Uranus, all planets in the solar system except Mercury can be seen with the naked eye. Only Mercury is unusually unique and disappears from time to time.
Looking at the sky from Uranus, Venus should be the brightest among all the planets that can be seen. Because Uranus is too far away from the sun, the sun in the sky of Uranus is actually a small disk. Not only that, when viewed from the Earth, the apparent diameter of the Sun is 31-32 minutes, while that of Uranus is only 2 minutes.
Uranus also has many "little fans". It has a lot of satellites, which may not block the sun on any given day, so solar eclipses will occur frequently. Among all the satellites of Uranus, there are many satellites that are large enough to cause solar eclipses, such as Oberon, Ariel and Miranda, these are the names of the satellites.
However, the most attractive thing about Uranus is its "attitude", because the rotation axis of Uranus is tilted, about 98 degrees, so Uranus is "lying and rotating", maybe it is the "geyouparalysis" in the universe.It is for this reason that most places on Uranus except the equator, day and night last half a year each.
Not only that, almost all of Uranus's satellites orbit on the equatorial plane. Coupled with Uranus's unique rotation method, its satellites are in an upward or downward state for most of the year. That is, we can only see half of the disk.
Neptune
The sky of Neptune is as blue as Uranus, but the sun does not look like a disk, but a point, which has an apparent diameter of only 1 minute in the sky. But it's 1,000 times brighter than the full moon shining in Earth's sky.
Neptune's largest satellite, Triton, looks super big, but it appears a bit blurry due to too little light.
Looking at the solar system from Neptune, the brightest one is Jupiter, followed by Venus, while the Earth, Uranus and Saturn are all extremely dim, and Mercury and Mars are directly invisible.
Author: Xiao Abe Proofreading: Chuan Chuan
