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WikiCards · Card list · Science cards · First observation of gravitational waves
Uncommon card · Science
First observation of gravitational waves, an Uncommon card
The first direct observation of gravitational waves was made on 14 September 2015 and was announced by the LIGO and Virgo collaborations on 11 February 2016.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 81
- DEF
- 99
- Power
- 180
- Wikipedia reads a year
- 48,000
Power 180 (ATK + DEF): stronger than 90 % of WikiCards cards.
First observation of gravitational waves quiz: 3 questions
Three questions on the First observation of gravitational waves card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
The ______ was named GW150914.
Answer
signal. The signal was named GW150914. From the First observation of gravitational waves article on Wikipedia.
Which of these Wikipedia articles is read the most in a year?
Answer
History of cholera. History of cholera 75,000 · First observation of gravitational waves 48,000 · Culture of Brazil 35,000 · History of science and technology in China 28,000 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.
- Previously, gravitational waves had been inferred only indirectly, via their effect on the timing of pulsars in binary star systems.
- The waveform, detected by both LIGO observatories, matched the predictions of general relativity for a gravitational wave emanating from the inward spiral and merger of two black holes and the subsequent ringdown of a single, 62 M☉ black hole remnant.
- The signal was named GW150914.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The First observation of gravitational waves article was read about 48,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 81 and blocks with 99: each hit it takes is cut by 40 %.
How to get First observation of gravitational waves
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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Card lists
- Wikipedia quizNew questions every day
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- Tier listS and A tiers by power (ATK + DEF)
Credits
Text : Wikipedia, First observation of gravitational waves (revision), CC BY-SA 4.0. Photo : B. P. Abbott et al. (LIGO Scientific Collaboration and Virgo Collaboration) - full list at, CC BY 3.0, Wikimedia Commons.
