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WikiCards · Card list · Science cards · H I region
Common card · Science
H I region, a Common card
An HI region or H I region is a cloud in the interstellar medium composed of neutral atomic hydrogen, in addition to the local abundance of helium and other elements.
- Rarity
- Common
- Domain
- Science
- ATK
- 43
- DEF
- 18
- Power
- 61
- Wikipedia reads a year
- 8,600
Power 61 (ATK + DEF): stronger than 5 % of WikiCards cards.
H I region quiz: 3 questions
Three questions on the H I region card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
This line has a very low transition probability, so it requires large amounts of ______ gas for it to be seen.
Answer
hydrogen. This line has a very low transition probability, so it requires large amounts of hydrogen gas for it to be seen. From the H I region article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
List of mountains of West Virginia. List of mountains of West Virginia 46 · H I region 43 · Otto Bayer 40 · List of Stalin's residences 35 ATK in WikiCards.
Which of these Wikipedia articles is read the most in a year?
Answer
H I region. H I region 8,600 · Hywel Thomas 6,000 · Nounkounkan 120 · Joseph Mrakh 93 Wikipedia reads over a year.
In a duel, each round asks a question like these about the opposing card, with 15 seconds to answer.
The facts on the card
The card carries these facts from its Wikipedia article.
- (H is the chemical symbol for hydrogen, and "I" is the Roman numeral.
- It is customary in astronomy to use the Roman numeral I for neutral atoms, II for singly-ionized, HII is H+ in other sciences, and III for doubly-ionized, e.g. OIII is O++, etc.) These regions do not emit detectable visible light but are observed by the 21-cm region spectral line.
- This line has a very low transition probability, so it requires large amounts of hydrogen gas for it to be seen.
Why it is Common
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The H I region article was read about 8,600 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 43 and blocks with 18: each hit it takes is cut by 7 %.
How to get H I region
Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.
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The cards just above and just below H I region in the power ranking, all domains together.
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- Trinomial expansionCommon · Science · ATK 42 DEF 19
- List of mountains of West VirginiaCommon · Nature · ATK 46 DEF 15
- Savage 1861 NavyCommon · History · ATK 43 DEF 18
Card lists
- Wikipedia quizNew questions every day
- All cards from A to ZEvery card, by name
- Science cards
- Legendary cards
- Tier listS and A tiers by power (ATK + DEF)
Credits
Text : Wikipedia, H I region (revision), CC BY-SA 4.0. Photo : Ruslik0 , NASA, Public domain, Wikimedia Commons.
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