The video discusses various scientific topics, including the potential collision of the Milky Way and Andromeda galaxies, the existence of supermassive black holes at the centers of these galaxies, and the concept of light and color perception.
The host, Endrew Marcelo, answers questions about the collision of the Milky Way and Andromeda galaxies. He explains that the galaxies are on a collision course and will eventually merge, forming a larger galaxy. However, the chance of a star colliding with another star is minimal, and the sky will change when the galaxies collide. More than 2 billion years after the collision, the Sun will enter a phase called the Red Giant and increase in size, potentially engulfing the Earth.
The host also discusses the existence of supermassive black holes at the centers of the Milky Way and Andromeda galaxies. When the galaxies collide, they will form a larger black hole at the center of the new galaxy.
The conversation also touches on the concept of light and color perception. The host explains that light is both a particle and a wave, and the color we perceive is determined by the wavelength of the light. Light with a wavelength between 400 and 700 nanometers is visible to the human eye, while light with wavelengths outside this range is not. Infrared light, for example, is below the visible spectrum and cannot be seen by the human eye, but can be detected by machines.
The host also answers a question about the energy potential of covering the Sahara desert with solar panels. He estimates that this could generate 575,000 GWh of energy per hour, enough to power the entire state of São Paulo for more than three years.
Finally, the host answers a question about the name of a roller coaster in Russia. He explains that the roller coaster in Russia is called "American" in Russian, while a roller coaster in the United States is called a "rollercoaster".
1. The video discusses the upcoming collision between the Milky Way and Andromeda galaxies.
2. The Milky Way and Andromeda galaxies are currently on a collision course and will eventually merge to form a larger galaxy.
3. The Milky Way is approximately 2.5 million light years away from the Andromeda galaxy.
4. The collision between the two galaxies is expected to occur in about 3.75 billion years.
5. The collision of the two galaxies will not cause any stars to collide with each other, reducing the chance of a cosmic collision with Earth.
6. Scientists believe that at the center of every galaxy, like the Milky Way, there is a supermassive black hole.
7. The black hole at the center of the Milky Way is called Sagittarius A and is 4 million times larger than the mass of our sun.
8. When the Milky Way and Andromeda galaxies collide, they will form a new supermassive black hole at their center.
9. The collision of the Milky Way and Andromeda galaxies will not cause immediate harm to Earth, but the sun will enter a phase known as the Red Giant phase, which could potentially engulf the Earth in about 2 billion years.
10. The video also discusses the concept of light and how it is perceived by the human eye, explaining that the colors we see are determined by the wavelength of light.
11. The video explains that the light that is visible to the human eye ranges from 400 to 700 nanometers.
12. The video also discusses the concept of night vision devices, explaining that while they can see light in the infrared spectrum, they do not see color.
13. The video concludes by stating that the entire state of São Paulo could be powered for more than three years with the energy generated by collecting sunlight in the Sahara desert for one hour.