Pratha Shah

  Why Pluto isn't a planet anymore?  Image src: https://www.forbes.com/      Pluto was the ninth planet of our solar system. Things were going exceptionally well for it until 2006, when International Astronomical Union said, 'Sorry, not everybody gets to be a planet'. Poor Pluto! But sometimes life isn't fair.          So, what changed in 2006?  Well, before 2006 there wasn't any strict definition of the word 'planet'. Instead, it was just an across-the-board given to celestial bodies that a) definitely weren't stars, b) also not asteroids or comets, and c) kind of large. But Pluto remained peculiar even with this definition. It was small, but not much farther out than one of the giant planets- Neptune. Also, it had an unusual orbit and a giant satellite. A giant satellite! Yes. Charon, one of Pluto's five natural satellite, is Pluto's largest satellite.  At half the size of Pluto, Charon  is the largest of Pluto's moons and the largest kno

Why isn't Jupiter a star ? Jupiter is bigger than some of the stars in the universe . The smallest star yet discovered is EBLM J0555-57Ab. In our solar system, there are two objects larger than this star. One is obviously the Sun. The other is Jupiter, with a mean radius of 69,911 kilometers . Also the gas giant, is mainly composed of hydrogen and helium. Then why is Jupiter a planet and not a star?  First  let us understand what makes a star a star:   A star is a huge celestial body made up of hydrogen and helium that emits light and heat from churning nuclear forges inside its core. In order for this fusion to occur, the star should be of a certain mass. Mass of a star is pivotal in dictating the course of its life.                                           Nuclear fusion in Sun Jupiter does not have enough mass to cause nuclear fusion. Hence, it is not a star. EMBLM J005-57Ab has mass 85 times that of Jupiter. This is as light a star can be.  Even though Jupiter isn't a star