What are the wonderful astronomical phenomena?

On a moonless night, when the stars are clearest, Dan Heller, who filmed this scene, camped on Mount Kilimanjaro at an altitude of 4,800 meters in Africa, and spent three and a half hours of exposure time shooting this beautiful scene.

The Secret of Black Aurora

Black aurora is a dark area between normal bright aurora. Images of aurora often record this dark area, but few people question its origin. Recently, scientists solved the mystery of the black aurora by using the data provided by four satellites named Cluster in Earth orbit.

Normal aurora is that electrons or negatively charged particles rush to the earth's atmosphere along the earth's magnetic field and hit the earth's atmospheric molecules.

Ionize the light they emit. Black aurora is a phenomenon that negatively charged particles in the earth's ionosphere are sucked out of the gap of the earth's magnetic field lines.

This dark anti-aurora extends to a height of 20 thousand kilometers, sometimes lasting for several minutes.

Stars that are not in the Milky Way.

Galaxies are all made up of stars, but are all the stars in galaxies? That's not true.

Using the Hubble telescope, the scientists of the female galaxy cluster found about 600 red giant stars in the laboratory.

Floating in the vast space between galaxies. The above picture was drawn by the artist from around such a lonely sun.

The sky that may be seen on the planet, where the night sky scene is completely different from that on the earth,

The night sky of the earth is full of stars-members of our galaxy, where the red sun is setting.

There are few stars in the sky, only dim galaxies-

A member of the Virgo galaxy cluster. This lonely sun was probably thrown out when galaxies collided a long time ago.

Aurora in Yukon, Canada

On September 28th and 29th, 2000/kloc-0, two coronal mass ejections occurred on the surface of the sun.

At the same time, high-energy particle waves rushed to the earth, triggering aurora activity.

A week later, the vibrating plate separating the magnetic field of the northern and southern hemispheres of the sun just brushed the earth, triggering another wave of aurora activity.

The new moon embraces the old moon.

A phenomenon commonly known as "the new moon embraces the old moon", the dark gray light faintly visible in the arms of a crescent moon is actually the light reflected from the sun shining on the surface of the moon.

Comets and auroras over Alaska

Can you point out the comet in the picture above? The cold sky over Alaska shows obvious and colorful aurora.

Just below the left, an inconspicuous object stands out in the background: Comet Iketani, which is the brightest comet in recent years.

This comet now appears in the east before sunrise and is almost invisible to the naked eye.

This comet is actually a huge snowball covered with dust. It has traveled in the outer solar system for most of its life and is now returning to where it came from.

A month outside Seattle

Does the moon near the ground look bigger?

The answer is no, as shown above, no matter where the moon is in the sky, its size is almost the same.

The cause of this common moon illusion is still the focus of debate. The two most common explanations are that the origin of illusion is that foreground objects make the moon near the ground look far away.

The oldest and most widely accepted saying is that the human brain will interpret distant objects as larger, while the newer saying further explains the illusion of distance, which makes human eyes focus differently.

In any case, the diameter of the moon is actually about 0.5 degrees.

Meteors and aurora

Star watchers reported that the Perseid meteor shower appeared as scheduled in the early morning of August 12 to 13, and there was a meteor every few minutes.

On the night of August 1 1, with Perseus rising off the ground, the astrophotographer Wade Clark was waiting to shoot a meteor across the sky at Baker Hill Ski Resort in northern Washington, USA, but he was lucky to see a beautiful Northern Lights performance.

Rocket smoke marks at sunset

The afterglow of the setting sun and the faint halo of the new moon add a lot of color to this photo of rocket smoke hovering in the night sky.

This digital image taken to the west was taken at Table Mountain Observatory in California on September 19, 2002.

At the time of shooting, the "Militia III" solid fuel rocket with smoke marks had already flown far away. Rockets launched from vandenberg air force base must fly thousands of kilometers across the Pacific Ocean with test loads.

The sunset that day dyed the cigarette label red/orange, and even rendered the top of the cigarette label white with Liang Cheng. The full moon just rising from the east painted the bottom of the smoke mark with a faint white color. The cloud gas at the top of the smoke trail is produced by rocket propulsion separation, and the water vapor in this part of the smoke instantly forms ice crystals in the cold high altitude. Because it is still bathed in the sunshine during the day, it produces many tiny rainbows.

3. Interviewee: Anonymous time: 06-1218:18: 37 Brief introduction of the total solar eclipse in China in 2008.

The eclipse is divided into 1.039, and the longest duration of the total eclipse is 2 minutes and 27 seconds. It can be found in northeastern North America, Europe and parts of Asia, including northern Canada, Greenland, Russia, Siberia, Mongolia and China. In China, considering the comprehensive factors such as the height of the sun, weather geography and traffic, the total solar eclipse belt mainly sweeps the northwest of China, and the probability of sunny weather in this area is high.

The area where the total solar eclipse occurred was banded. In addition to Barkun County and Yiwu County in Xinjiang, there will also be a very short total solar eclipse in Jiuquan, Gansu. On the same day, a partial solar eclipse can be observed in Urumqi.

On August 1 day 18: 09, the sun will begin to lose its first sight near Balikun. By 19: 08, the sun will be completely blocked, which is called an eclipse. The duration of the total solar eclipse is 1: 55, and the sun will appear slowly at 19: 55.

Time: August 2008 1, Universal Time 1 1:00 UT (Beijing time 19: 00).

Observation sites: Altai, Hami (Xinjiang), Jiuquan, Lanzhou (Gansu) and Xi 'an (Shaanxi).