our solar system had 9 planets but one of them was lost. can you tell about that planet?
Answers
Answer:
The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet. ... It contains the asteroid belt as well as the terrestrial planets, Mercury, Venus, Earth, and Mars.
Explanation:
Answer:
The 19th-Century travel writer and businessman – fabulously wealthy, perennially moustachioed, and often found in crisp three-piece suits – had read a book on Mars, and on this basis, decided to become an astronomer. Over the coming decades, he made a number of wild claims.
First up, he was convinced of the existence of Martians, and thought he had found them (he hadn't). Others had documented strange lines traversing the planet, and Lowell suggested that these were canals, built as the last attempt of a dying civilisation to tap water from the polar ice caps. He used his fortune to build an entire observatory, just to get a better look. It turned out they were an optical illusion, created by the mountains and craters on Mars when viewed through low quality telescopes.
Lowell also believed that the planet Venus had spokes – seen in his notes as spidery lines emanating from its centre (it doesn't). Though his assistants tried to find them, it seemed that only he could see this unexpected detail. It's now assumed that they were shadows cast from the irises in his own eyes, as he looked through his telescope.