===== Did You Know? =====

By [[yiler-huang| Yiler Huang]]

Solar system: Did you know that there might be a real ninth planet in our solar system? I thought there were only eight planets in our solar system, but in 2016 a person called Mike Brown discovered a hypothetical planet called Planet X.
你知道嗎，在我們的太陽系中可能有一顆真正的第九顆行星。我以為我們的太陽系中只有八顆行星，但在 2016 年，一個名叫邁克·布朗的人發現了一顆假設性的行星： Planet X。

Galaxy: Did you know that there is a supermassive blackhole in the center of our Milky Way. I thought the Milky Way only had a bunch of stars.
你知道我們銀河系的中心有一個超大質量黑洞嗎？我以為銀河系只有一堆星星。

Space travel: Did you know that NASA spent millions of dollars just for making a pen that can write in space. I thought people used pencils in space. 你知道嗎，美國太空總署花了幾百萬美元只為了做出一隻能在太空寫字的原子筆。我以為太空人都用鉛筆寫字。

Other: Did you know that time traveling could be possible in space if your speed is fast enough? 你知道嗎，只要你的速度夠快，在太空有可能就會發生時空旅行。

==== References ====

NASA. (n.d.). Planet X. NASA Solar System Exploration. Retrieved March 2, 2022, from https://solarsystem.nasa.gov/planets/hypothetical-planet-x/in-depth

Ghod, C. (2022, January 12). The Milky Way’s supermassive black hole is leaking gas. Space.Com. https://www.space.com/supermassive-black-hole-leaking-in-milky-way

Curtin, C. (n.d.). Fact or Fiction?: NASA Spent Millions to Develop a Pen that Would Write in Space, whereas the Soviet Cosmonauts Used a Pencil. Scientific 
American. Retrieved March 2, 2022, from https://www.scientificamerican.com/article/fact-or-fiction-nasa-spen/

Stein, V. (n.d.). Is time travel possible? | Space. Retrieved March 2, 2022, from https://www.space.com/21675-time-travel.html