Challenge it. Talk about space.

The universe is full of mystery, and we know little about it. The exploration of the universe is very limited at present. Even so, I found something strange in the universe. See if you can understand.

antimatter

Just like bizzaro, Superman's other self, the particles that make up normal matter have the opposite version. For example, an electron is negatively charged, but its antimatter equivalent positron is positively charged. Matter and antimatter annihilate each other in the collision, and their mass is converted into pure energy by Einstein equation E=mc2. Some future spacecraft designs may use antimatter engines.

miniheidong

If a brand-new theory of gravitational "movie world" is correct, there are thousands of small black holes scattered in our solar system, each of which is about the size of a nucleus. Unlike larger black holes, these mini black holes are the original remnants of the Big Bang. Because it is closely related to the fifth dimension, it has different effects on time and space.

Cosmic microwave background

This radiation, also known as CMB, is the original legacy of BIGBANG. It was first detected in 1960' s, and it seems to emanate from anywhere in space. CMB is considered as one of the best evidences of the theoretical Big Bang. The temperature of China and Pakistan recently measured by WMAP project is -270 degrees Celsius.

dark matter

Scientists believe that dark matter constitutes most of the matter in the universe, but it can neither be directly seen nor detected by using the existing technology. Candidates range from light neutrinos to invisible black holes. Some scientists question whether dark matter really exists, and some scientists think that gravity can be better understood through it.

Exoplanet

Until the early 1960s, the only known planet in the universe was the familiar planet in our solar system. But since then, astronomers have gradually discovered more than 500 exoplanets. They range from giant gas planets with slightly lower mass than stars to small rocky planets orbiting dim red dwarfs. However, the search for a second earth is still in progress. Astronomers generally believe that better technology may eventually find a world similar to ours.

gravity wave

Gravitational waves are distortions of the space-time structure predicted by Albert Einstein's general theory of relativity. Gravitational waves travel at the speed of light, but they are so weak that scientists hope to detect only those gravitational waves generated in huge cosmic events, such as the black hole merger shown above. LIGO and Lisa are two detectors designed to find elusive waves.

Galaxy cannibalism

Just like life on earth, galaxies can "devour" each other and evolve over time. Astronomers have found that Andromeda, the neighbor of the Milky Way, is currently "dining". The above picture comes from the simulation of Andromeda colliding with our galaxy, which will happen in about 3 billion years.

neutrino

Neutrinos are electrically neutral, have almost no mass elementary particles, and can pass through several kilometers of lead unimpeded. When you read this article, some neutrinos are passing through your body. These "phantom" particles are produced in the burning internal flames of healthy stars and supernova explosions of dying stars. Therefore, neutrino detectors should be placed deep underground, at the bottom of the sea or in large ice cubes.

Quasi-stellar object

These "stars" shine at us from the edge of the universe, reminding scientists that our universe is in the early stage of chaos. Quasars release more energy than hundreds of galaxies combined. Common sense is that they are giant black holes in the center of distant galaxies. This photo is a quasar 3C 273, taken at 1979.

vacuum energy

Quantum physics tells us that, contrary to the superficial phenomenon, vacuum is a bubble of "virtual" subatomic particles that are constantly being created and destroyed. Transient particles give every cubic centimeter of space a certain amount of energy. According to the general theory of relativity, this energy will produce an anti-gravity and separate the space. However, no one knows what caused the accelerated expansion of the universe.