教員コラムBlog

  1. home
  2. 教員コラム / Blog
  3. 詳細 / Detail

A Year on Planet 9

2021.12.13
  • Ben McDonough
  • Others|Hobbies_LeisureActivities
  • Advanced
  • 2021
Wasei-eigo words may sound very similar to the English versions, but such words and expressions have quite different meanings to their English counterparts and can be the cause of some confusion! For example, ‘ソーラーシステム’ also refers to an electrical water heating system powered by sunlight, whereas ‘solar system’ refers to the eight planets and their moons in orbit around the sun, together with smaller bodies such as asteroids, meteoroids, and comets.

For those who are interested in English and astronomy, naming the eight planets of our solar system in English should be a simple challenge. (Hint: My Very Educated Mother Just Served Us Noodles) Most of the planets can be seen in the night sky with the naked eye at some point throughout the year. Mars reflects sunlight off its red sands, while both Saturn and Jupiter shine brightly due to their great size, whereas Neptune and Uranus require a powerful telescope to be seen.  

Did you also know that there were officially nine planets for a brief period of scientific history, between 1930 to 2006? Pluto is the name of the previously ninth planet. However, it has a surface area of only 3.3% of Earth’s, which is roughly equal to Russia’s, and other similarly sized objects in Pluto’s part of the solar system were later discovered. These facts meant that Pluto was eventually reclassified to ‘dwarf planet’ status and the list went back down to eight.

However, Pluto was not simply found by looking at the night sky. Although it is visible by telescope, it is extremely dim due to its size and distance. After the discovery of Neptune in 1845, astronomers who were beginning to understand the formation of our solar system, had also found evidence of an object at 250 times the distance of the earth to the sun which was affecting the orbits of smaller nearby bodies. In the search for this mysterious object, Pluto was found, but we now know that it is not the cause of the orbital anomaly. In the same way that our moon is held by the larger Earth’s gravitational pull, this orbital anomaly has recently been calculated at about five times the mass of Earth’s. Could there actually be a large ninth planet? If so, where did it come from? Was it formed in our solar system or is it a rogue planet from another system captured by the gravitational pull of our sun? At such a distance, Planet Nine could take a minimum of an incredible 10,000 years to orbit the sun.

Other theories posit that the anomaly may even be a black hole. Which would be more exciting to discover and confirm? There is still so little known about the outer edges of the solar system, but research like the hunt for Planet Nine goes on.

Photo credit: Pixabay 


Quiz

Q1. What are the three types of lesser sized objects in the solar system?

Q2. What are the names of the eight major planets?

Q3. What is an alternative idea to the existence of Planet Nine?



Scroll down ↓ for the answers





























A1. Asteroids, meteors, and comets.
A2. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
A3. There is a black hole at the edge of our solar system

戻る / go back

Related posts