These planets aren't real!

Key Concepts:

• Vulcan: Hypothetical planet between the Sun and Mercury.
• Phaeton: Hypothetical planet between Mars and Jupiter.
• Counter-Earth: Hypothetical planet on the opposite side of the Sun from Earth.
• Mercury's Orbit: The unusual orbit of Mercury.
• Einstein's Theory of Relativity: The theory used to explain Mercury's orbit.
• Asteroid Belt: The region between Mars and Jupiter containing numerous asteroids.
• Jupiter's Gravity: The strong gravitational force exerted by Jupiter.

Hypothetical Planets and Their Disproof:

The video discusses three hypothetical planets that were once believed to exist but have since been disproven: Vulcan, Phaeton, and Counter-Earth.

• Vulcan: Astronomers observed that Mercury's orbit was peculiar, suggesting an additional gravitational influence. Drawing a parallel to the discovery of Neptune (found due to Uranus's orbital anomalies), they hypothesized the existence of a planet named Vulcan orbiting between the Sun and Mercury. However, Vulcan was never found. The video states that the anomaly in Mercury's orbit is actually explained by Einstein's theory of relativity, which accounts for the curvature of spacetime near massive objects like the Sun.

• Phaeton: The existence of the asteroid belt between Mars and Jupiter led to the hypothesis of a planet called Phaeton that supposedly disintegrated. The video explains that Phaeton never existed because Jupiter's immense gravity would have prevented a planet from forming in that region. Jupiter's gravitational influence is so strong that it would disrupt the accretion process necessary for planet formation.

• Counter-Earth: Ancient Greek philosophers proposed the existence of Counter-Earth, located on the opposite side of the Sun from Earth. This planet was thought to balance Earth's orbit. The video simply states that Counter-Earth does not exist.

Pluto's Demotion vs. Non-Existence:

The video concludes by contrasting Pluto's demotion from planet status with the non-existence of Vulcan, Phaeton, and Counter-Earth. While Pluto is no longer considered a planet, it still exists as a celestial body. The video suggests that it is preferable to have existed and been reclassified ("a has been") than to have never existed at all ("a never was").