¿Por qué PLUTÓN ya no es un planeta? | Con Star Tres

The video discusses the reclassification of Pluto from a planet to a dwarf planet, following the discovery of Eris and other celestial bodies. It explains the International Astronomical Union's 2006 definition of a planet, which requires a celestial body to orbit the sun, be spherical, and clear its orbit. Pluto fails the third criterion, leading to its reclassification. The video also covers the controversy surrounding this decision and new proposals for defining planets, emphasizing a geophysical approach that focuses on a body's shape and mass rather than its orbit.

What was the main reason for reconsidering Pluto's status as a planet?

• Pluto was too far from the Sun.

• New celestial bodies were discovered in the same region.

• Pluto was not spherical.

• Pluto was too small.

What year did the International Astronomical Union redefine the term 'planet'?

• 1992

• 2005

• 2006

• 2010

Which of the following is NOT a criterion for a celestial body to be classified as a planet according to the IAU?

• It must orbit the Sun.

• It must have a spherical shape.

• It must have a moon.

• It must have cleared its orbit.

Why was Pluto reclassified as a dwarf planet?

• It does not orbit the Sun.

• It is not spherical.

• It has not cleared its orbital neighborhood.

• It is too close to the Sun.

What is a key difference between a planet and a dwarf planet?

• A planet is spherical, while a dwarf planet is not.

• A planet orbits the Sun, while a dwarf planet does not.

• A planet has cleared its orbit, while a dwarf planet has not.

• A planet is larger than a dwarf planet.

Who was in favor of the reclassification of Pluto as a dwarf planet?

• New Horizons team

• José Luis

• Mike Brown

• Alan Stern

What is the proposed new definition of a planet according to the alternative proposal?

• A body that is not a satellite and has a spherical shape.

• A celestial body that is larger than a dwarf planet.

• A substellar mass body that has never undergone nuclear fusion.

• A body that orbits the Sun and has moons.