article_snippet: Spanish astronomers have revealed a new theory for a 'Y' shape on Venus (annotated image from the Pioneer Venus Orbiter in 1979 shown).
article_snippet: Spanish astronomers say a new theory for a 'Y' shape on Venus (annotated image from the Pioneer Venus Orbiter in 1979 shown) is formed by winds pushing a 'wave' of clouds on the planet.
article_snippet: When astronomers first started taking images of Venus, astronomers were somewhat baffled by a mysterious 'Y' shape that covered the planet.
highlights_snippet: Last week astronomers revealed a new theory for a 'Y' shape on Venus .
  
highlights_snippet: astronomers say a new theory for a 'Y' shape on Venus is formed by winds pushing a 'wave' of clouds on the planet .