The speed of light (more generally, the speed of propagation of electromagnetic radiation) in a vacuum, denoted c, is an important fundamental physical constant in many areas of physics. It has an exact value of 299,792,458 meters per second, because the meter length unit is redefined based on this constant and the standard second. According to special relativity, c is the maximum speed that all energy, matter, and information in the universe can reach. It is the speed at which every massless particle bound to physical fields (including electromagnetic radiation such as light photons) propagates in a vacuum. It is also the propagation speed of gravity (such as gravitational waves) predicted by current theories. Particles and waves travel with velocity c regardless of the motion of the source or of the observer’s inertial frame of reference. After Einstein founded relativity, it became known that the speed of light is indeed very fast, because this is the upper limit of the local speed in the universe, and no other speed can be exceeded. through it. Moreover, regardless of the medium in the frame of reference, the measured speed of light is exactly the same. Based on the principle of the constant speed of light in relativity and the highly accurate measurement of the speed of light, physicists have also determined the speed of light to be 299,792,458 meters/second without affecting the speed of light. affect the current physical quantity. In this way, people no longer have to worry about accurately measuring the speed of light, and can also solve the problem of errors in the equipment used to determine the clock. The speed of light propagating in a vacuum is independent of both the motion of the light source as well as of the observer’s inertial frame of reference. The constancy of the speed of light was postulated by Einstein in his 1905 paper on special relativity. Physicists can now only experimentally confirm the speed of light by methods above two Two-way speed of light is frame-independent, because the speed of light cannot be measured in one-way speed of light, ignoring some conventions of uniformity. synchronization between the clock at the source and the clock at the receiver. Whether it’s electron transition, nuclear fusion, nuclear fission, or the annihilation of yin and yang matter, these processes produce light. Once light is created, their speed will immediately reach the speed of light, and they will always travel at this speed. If light were not absorbed by matter, they would not be dissipated in the universe, and the speed would always remain at the speed of light. For example, the first photons created in the universe 13.8 billion years ago are still present today, and they travel through the universe at the speed of light. So, how did light reach the speed of light? How does light maintain the speed of light? What is the driving force that drives the light forward? If it is explained from the point of view of the particle nature of light, then light is composed of photons with no rest mass. According to special relativity, since the static mass of photons is zero, their speed can only be the speed of light. According to the Higgs mechanism of the Standard Model of Particle Physics, when photons without static mass pass through the Higgs field throughout the universe, the photons will not be coupled, so they will not gain static mass, and their speed will not decrease. Once the photons are generated, their speed will directly reach the speed of light, and there is no acceleration from zero to the speed of light. Propagation of photons does not require energy to propagate, if they were not absorbed by matter or a black hole, they would always travel aimlessly through a vacuum at the speed of light. On the other hand, if explained from the evaporation of light, the nature of light is electromagnetic wave. Maxwell’s equations of electromagnetism show that electricity and magnetic fields are essentially unified, that a changing electric field excites a magnetic field, and a changing magnetic field excites a repeated electric field, creating out electromagnetic waves. Since electromagnetic fields are formed at the speed of light, electromagnetic waves travel at the speed of light. The generation and existence of electromagnetic fields are independent of the medium, so light can travel at the speed of light in a vacuum. Although the spatial structure continues to expand, light propagating through space will appear redshift, but they will not completely disappear in the universe.

Canh Diem’s ​​studio has just released a new set of photos. In the photo, the beauty born in 1988 poses with orchids, simple but heart-fluttering. Canh Diem wears a beige satin strapless dress, revealing her bare shoulders and fair skin. She let her hair down naturally, the highlight being dragonfly earrings. The face is made up of delicate makeup, from willow-leaf eyebrows, pigeon eyes, straight nose bridge and plump lips. In Canh Diem exudes a harmonious and luxurious beauty, true to the standard of a “golden branch and jade leaf”. At the age of 33, the beauty of the actress seems to be unchanged over time, even more loving, not shy with the title “First beautiful woman in Beijing”. After years of carrying the title of “box office poison”, Canh Diem has the opportunity to take revenge in 2021 with “Tu Dang”. In the film, she transforms into the beautiful, cold, young and old-fashioned love of Tu Dang. The role was evaluated as “measure and make shoes” for Canh Diem. Trinh Sang’s pure and noble temperament, plus wearing classic cheongsam sets, makes viewers completely “collapse” in front of Tu Dang. Netizens commented, she came out from the original. After the movie, Canh Diem has a new title, “cheongsam goddess”. The successful film helped Jing Tian score points in the hearts of the Chinese public. She is not only more sought after, the number of fans skyrocketed, but also actively “pushed the boat” by netizens with her younger co-star Truong Bin Bin.

Diem My is a name that is not unfamiliar to the Vietnamese audience, she is known as the ‘Queen of the Calendar Photo’ and is an idol of young people in the years 8x and 9x. At that time, Diem My was always the first choice of photographers and brands and created a fever of calendar photos. The youthful time used to “make rain and wind” The actress always has a strong foothold in the entertainment industry because of her beautiful beauty. And is the beauty “reigning” for the longest time on the covers, magazines, calendar photos … Diem My often raises her hair, revealing her delicate and graceful face. Possessing delicate Asian lines, Diem My charming face as a calendar model in 1983. In 1994, she suddenly got into a flower car with businessman Ha Ton Duc and focused more on family. In her youth, her bright colors were often chosen by her to show off her face. Diem My is loyal to her neat hairstyle to help her elegant face increase her pure and pure beauty. Beauty “timeless” Entering middle age, but Diem My still retains a radiant, noble face. Regardless of her age, from her skin to her body, Diem My takes care of her, making her beauty immutable with time. According to Diem My, to be able to maintain a good shape and beauty, it is because she has not eaten for 35 years. Instead, the actress only ate vegetables, fruits, protein supplements like grilled meat or steamed fish to limit cholesterol and harmful fats for health. In recent years, the actress has chosen a modern aristocratic style with a deep and nude color make-up that highlights her age-old temperament. Appearing at major events, Diem My always knows how to make herself become attractive with a beautiful and luxurious face. She is not afraid to change her style, choosing youthful and sexy designs. Even at the middle age, the beauty is still fascinated with eye-catching colorful sets and becomes the focus. Accompanying the outfit is a series of luxurious accessories to help beauties more splendid and arrogant. Even at the middle age, the beauty is still fascinated with eye-catching colorful sets and becomes the focus. Accompanying the outfit is a series of luxurious accessories to help beauties more splendid. She often shares on her personal page about her lifestyle: “ A happy woman is simply someone who loves herself, takes control in life and is always confident and optimistic. “. After 27 years, the actress and her husband are still together with a perfect home with two daughters. In its heyday, the pink ball has achieved many achievements. Until now, Diem My still retains her own charm. In addition to the unmatched beauty, the increasingly luxurious fashion sense, the ‘Queen of calendar photo’ style is also a remarkable highlight. Rose
Photo: FBNV

Jisoo is praised for being the prettiest with long hair

But once, in 2019, Jisoo appeared at the airport with a few short curls. Jisoo with thin bangs looks very youthful and lovely, also received a lot of praise for her beauty regardless of hairstyle. That day, everyone thought Jisoo wanted to renew himself, change his image.

Jisoo used to cause fever with thin, youthful bangs

K-Pop idols constantly change their hairstyles, so no one wonders. But it turns out that Jisoo is not accidental, but cuts the roof. At that time, she had a pimple growing right on her forehead. Although Jisoo has stuck the acne mask on, but Jisoo is still not confident, afraid that the press, the audience who takes close-ups will find out immediately, so he has to let his hair thin to cover the acne.

Jisoo with thin bangs is also perfect

Indeed Jisoo made a very wise decision. The bangs covered the acne, not to mention the audience was busy praising Jisoo’s sweet and youthful new hair, so no one bothered to find the true reason that the oldest sister, BLACKPINK, suddenly had a bang.