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WikiCards · Card list · Science cards · Comoving and proper distances
Uncommon card · Science
Comoving and proper distances, an Uncommon card
In standard cosmology, comoving distance and proper distance are two closely related distance measures used by cosmologists to define distances between objects.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 64
- DEF
- 43
- Power
- 107
- Wikipedia reads a year
- 36,000
Power 107 (ATK + DEF): stronger than 45 % of WikiCards cards.
The facts on the card
The card carries these facts from its Wikipedia article.
- Comoving distance factors out the expansion of the universe, giving a distance that does not change in time except due to local factors, such as the motion of a galaxy within a cluster.
- Proper distance roughly corresponds to where a distant object would be at a specific moment of cosmic time, which can change over time due to the expansion of the universe.
- Comoving distance and proper distance are defined to be equal at the present time.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Comoving and proper distances article was read about 36,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 64 and blocks with 43: each hit it takes is cut by 17 %.
How to get Comoving and proper distances
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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Credits
Text : Wikipedia, Comoving and proper distances (revision), CC BY-SA 4.0. Photo : NASA / WMAP Science Team, Public domain, Wikimedia Commons.
