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WikiCards · Card list · Science cards · Hubble volume
Uncommon card · Science
Hubble volume, an Uncommon card
In cosmology, a Hubble volume or Hubble sphere, subluminal sphere, causal sphere and sphere of causality is a spherical region of the observable universe surrounding an observer beyond which objects recede from that observer at a rate greater than the speed of light due to the expansion of the universe.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 54
- DEF
- 30
- Power
- 84
- Wikipedia reads a year
- 24,000
Power 84 (ATK + DEF): stronger than 25 % of WikiCards cards.
Hubble volume quiz: 3 questions
Three questions on the Hubble volume card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
The surface of a Hubble sphere is called the ______ horizon, the Hubble surface, or the Hubble limit.
Answer
microphysical. The surface of a Hubble sphere is called the microphysical horizon, the Hubble surface, or the Hubble limit. From the Hubble volume article on Wikipedia.
In which decade?
The Hubble volume is approximately equal to ____ cubic light years.
Answer
1030s. The Hubble volume is approximately equal to 1031 cubic light years. From the Hubble volume article on Wikipedia.
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.
- The Hubble volume is approximately equal to 1031 cubic light years.
- The proper radius of a Hubble sphere is c / H 0, where c is the speed of light and H 0 is the Hubble constant.
- The surface of a Hubble sphere is called the microphysical horizon, the Hubble surface, or the Hubble limit.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Hubble volume article was read about 24,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 54 and blocks with 30: each hit it takes is cut by 12 %.
How to get Hubble volume
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.
More Science cards
Cards close in power
The cards just above and just below Hubble volume in the power ranking, all domains together.
- BolsterUncommon · Arts · ATK 50 DEF 34
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- Free Brazil MovementUncommon · History · ATK 53 DEF 31
- ManzanillaUncommon · Science · ATK 50 DEF 34
- OutriggerUncommon · Science · ATK 48 DEF 36
- GanapatyaUncommon · Society · ATK 52 DEF 32
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, Hubble volume (revision), CC BY-SA 4.0. Photo : Andrew Z. Colvin, CC BY-SA 3.0, Wikimedia Commons.
