The evening was over, and it was quickly getting dark.

Gu Lei came to Tiewei No. 3 No. 1 Noble Middle School as promised.

Looking at the still dilapidated and gloomy gate in front of him, he had a lot of different emotions in his heart.

But this time, instead of climbing over the door wall like last time, the door automatically "creaks" and slowly opens.

The familiar sound of the beautiful piano sounded again, and Gu Lei calmly stepped into the dark barren school garden.

Following the guidance of the sound of the piano, Gu Lei walked into the music classroom that had appeared in his dreams many times with a nostalgic face.

Under the scarlet red sun, the phantom fairy played as selflessly as in a dream, and the flying blonde hair reflected a beautiful brilliance like flowing gold.

This is probably a phantom!

Gu Lei quietly admired the stubborn back of the girl who fought against fate unyieldingly, and felt a little sympathy in his heart, silently waiting for the end of the song.

After waiting for almost half an hour, with the dull high-pitched sound of pathos far greater than memory, "Revolutionary Night" ended in tragedy again.

Gu Lei savored the sad afterglow, while Nastasia sighed and said:

"Fate is so unpredictable!"

Gu Lei deeply agrees:

"Yes!"

Nastasia cut her long hair, then stood up, walked around the chair and turned to face Gu Lei.

The girl's movements are unhurried, and her every move is elegant, which is simply a perfect example of etiquette class, but it is full of infinite temptation. Especially at the moment when she was about to turn around, the extremely beautiful curves almost made Gu Lei open his mouth wide in gaffe.

She was still dressed when she first met tonight, but the school uniform happened to be a little tighter than last time, like a cold senior sister. The legs that were stretched in black stockings were still the same slender and eye-catching.

Gu Lei couldn't help but feel a little hot in his heart, but he still had an unchanged smile on his face. He was thinking about how to start, when Nastasia said with a light smile:

"But no matter how impermanent fate is, there must be a reasonable logic behind it."

This was really a bit confusing, Gu Lei asked honestly:

"How?"

Nastasia didn't answer, turned around slowly, turned her back to Gu Lei and asked:

"Do you know the Big Bang theory?"

As the girl spoke, the piano quickly folded and folded under the floor, and the red sun hanging high slowly drifted to the girl's side, condensing into a small glowing dot.

It turned out that the realistic red sun was actually just a beautiful stereoscopic projection.

"Yes."

Of course, Gu Lei would not understand.

The Big Bang theory is not only a creation theory that describes how energy generates the universe and all living beings within it, but also the basis of the theory of public ownership of property rights, which is well known in the Republic of Camilla.

However, Nastasia still took the trouble to explain it carefully to Gu Lei again. The small dot of light began to shine brighter and brighter.

"How could the ancients have imagined that about 15 billion years ago, the universe we live in was such an insignificant dot. Scientists will call it the singularity, it is infinitely small in size, but it contains infinite energy, infinite energy density, infinitely high temperature, and all the laws of physics will fail here, regardless of space and time. Until one day......"

The small dot of light suddenly swelled rapidly, and in the blink of an eye, the entire room was shrouded in a somewhat blinding light.

Gu Lei's brows furrowed slightly, and the bright light somewhat hindered his perception. But Nastasia didn't make any dangerous moves.

"This singularity expands at a rate beyond our imagination, forming a huge universe on a scale beyond our imagination. At this time, because the energy density decreases and the temperature drops, just like the molten iron is cooled and solidified into iron, the energy condenses the original material particles, quarks. ”

The dim light represented a drastic drop in temperature, and Nastasia's cold voice continued to emanate from the hazy mist of light.

"Originally, the universe was a sea of fiery quarks, with temperatures of up to 100 billion billion degrees. Then, as the universe continues to expand, the density continues to decrease, and the temperature naturally decreases, the quarks are forcefully formed into larger subatomic particles such as protons and neutrons, and the residual force bonds the neutrons and protons into atomic nuclei, and then finally ...... after about 300,000 years."

By this time the ubiquitous light had completely faded, and Nastasya had turned back at some point, holding a beautiful nebula in front of her, and her gaze was even more beautiful than the nebula.

"The electrons are captured by the electromagnetic force generated by the nucleus, and in the same way that planets are grabbed by stars to form galaxies, larger atoms are formed, and the first macroscopic matter, the atom, is born. This is why hydrogen and helium are the two substances that are most abundant in the entire universe. Because they are the simplest, the former has only one electron and one proton, while the latter has a larger nucleus with one more neutron. Because they are the easiest to form. ”

Nastasia continued with a little passion, and the nebula in front of her continued to collapse and condense.

"These substances are diffused in the form of gases in all corners of the universe, and then, because of the huge gravitational pull brought by a large amount of matter, the gas slowly condenses into nebulae of different sizes, and continues to be compressed by gravity to the point that they can no longer be compressed, so that after 1 billion years, the large nebulae are ignited by fission and fusion."

Nastasia's eyes couldn't help but burst into flames, and even Gu Lei couldn't help but be infected.

In the midst of them, a little fire suddenly lit up in the center of the nebula, igniting the entire nebula and turning it into a brilliant ball of fire, which was the first star, the beginning of all beings.

"The huge gravitational pull brings tremendous pressure, the hydrogen atoms or helium atoms in the center of the nebula are tightly squeezed together, the electrons are squeezed out, the nuclei are constantly broken and recombined, fission and fusion destroy the nuclei of light atoms such as hydrogen and helium, but it also leads to the formation of larger and more complex nuclei, trapping more electrons and forming more massive and complex atoms."

Seeing a scorching star born in front of him, Gu Lei's eyes also lit up.

"In this way, our universe has gradually become colorful, with all kinds of material atoms with masses larger than light atoms such as hydrogen and helium, making up large and small stars and various planets. Then, after tens of billions of years of evolution, on the planets, these atoms formed more unpredictable and colorful molecules, and finally gathered into the most complex molecular polymer - life. ”

The later part about the formation of galaxies and the evolution of life was demonstrated too quickly in the video, and Gu Lei was dazzled.

However, Gu Lei had also guessed the girl's intentions.

Sure enough, Nastasia's eyes quickly turned cold, and she concluded:

"Living matter is made up of all kinds of molecules, molecules are made up of atoms, and different atoms are made up of the same subatomic particles, which can be broken down into quarks and energy. In the final analysis, the universe, matter, and life are just different advanced forms of energy. ”

The corners of Gu Lei's mouth couldn't help but curl up slightly, while Nastasia paused, and said with some solemnity and playfulness:

"Then the question is, since matter is a mass of energy aggregates, and life is just a mass of energy aggregates, then on what basis can it be said that matter belongs to a certain life, even if it is a certain group of life?"