우주학 개론 제 15강 (명왕성, 카이퍼벨트와 오르트 구름, 센타우리 프록시마, 광속을 향한 도전과 꿈 - 영어더빙, 한국어자막)

Introduction to Cosmology, Lecture 15 (Pluto, Kuiper Belt and Oort Cloud, Centauri Proxima, Challenges and Dreams toward the Speed ​​of Light - English dubbing, Korean subtitles)


Sailing the blue seas like Magellan of old,
The courage of the Age of Discovery, dreaming of humanity.

Beyond Pluto and the Kuiper Belt's border,
Embarking on a journey at the speed of light to Proxima Centauri.

Following the shining stars of a trinary system,
Unlocking the door to alien planets.

Our footsteps traverse the treacherous cosmos,
Dreams of diverse hues scattered across the infinite universe.

Dancing to the rhythm of the stars and singing,
Exploring the mysteries of alien planets with a spirit of challenge.

The courage of humanity soaring at the speed of light,
An endless longing for the mysteries of the universe.

In this era of adventures sailing towards those dreams,
Anticipating the day when we reach out and touch them with our own hands.

Today, in Astrophysics Lecture 15, we will delve into the challenges and dreams of humanity regarding Pluto, the Kuiper Belt, the speed of light, and more. Your subscriptions and likes greatly support video production.

Pluto was known as the 9th planet in the solar system, but it was reclassified as a dwarf planet in 2006. Pluto is primarily composed of ice and rock, with a diameter of about 2,376 km. Pluto is on average 3.95 billion km away from the sun, and it takes about 248 years to orbit the sun once. Pluto has a very fast rotation speed, with a day lasting only about 6 hours. Pluto has five moons, the largest of which is Charon.
The Kuiper Belt is a disc-shaped region of the solar system located beyond the orbit of Neptune. It extends from about 30 to 55 AU (1 AU is the average distance between the sun and the earth, about 150 million km) from the sun. The Kuiper Belt contains millions of icy objects thought to be remnants left over after the formation of the solar system. Some of these are classified as dwarf planets or comets. The most famous object in the Kuiper Belt is Pluto, and there are also Eris, Makemake, Haumea, and others.
The Kuiper Belt and the Oort Cloud are collections of icy objects in the outer regions of the solar system. However, the two regions differ in distance, shape, and composition.
The Kuiper Belt is a disc-shaped region located beyond the orbit of Neptune, extending from about 30 to 55 AU (1 AU is the average distance between the sun and the earth, about 150 million km) from the sun. The Kuiper Belt contains millions of icy objects thought to be remnants left over after the formation of the solar system. Some of these are classified as dwarf planets or comets. The most famous object in the Kuiper Belt is Pluto, and there are also Eris, Makemake, Haumea, and others.
The Oort Cloud is located within the gravitational field of the solar system and can sometimes be drawn into the inner solar system by the gravity of external objects. The Oort Cloud is a much more distant space region thought to extend from about 5,000 to 100,000 AU from the sun. Unlike the Kuiper Belt, which is thought to be a relatively flat and uniform spatial region, the Oort Cloud is thought to be a spherical cloud of icy objects surrounding the solar system. The Oort Cloud is estimated to contain about 1 trillion objects, most of which are believed to be the source of long-period comets.
The Kuiper Belt and the Oort Cloud play an important role in understanding the history and structure of the solar system. They can also help explore the possibility of extraterrestrial life.

The closest galaxy to the solar system is not Alpha Centauri, but the Canis Major Dwarf Galaxy. This galaxy is a satellite galaxy of our Milky Way, and it’s only about 25,000 light-years away from the solar system.
Alpha Centauri is not a galaxy, but a triple star system, and it contains the closest stars to the solar system. These stars are distinguished as Alpha Centauri A, B, and C, with C also known as Proxima Centauri.
There are two planets discovered in the Alpha Centauri system. One is the rocky planet Proxima b, which orbits Proxima Centauri, and the other is the gas planet Alpha Centauri Bb, which orbits Alpha Centauri B.
Proxima b is the closest exoplanet to the solar system and has a size and mass similar to Earth. This planet is at an appropriate distance from its star, so it is located in the habitable zone where liquid water could exist on its surface.
Alpha Centauri Bb, discovered in 2012, is the first planet discovered in the Alpha Centauri system. This planet has a mass 1.13 times that of Jupiter and is very close to its star, resulting in a surface temperature of about 1200 degrees Celsius.