TEXTO
Uranus: Why we should visit the most unloved planet
Uranus is almost certainly the most unloved planet ∈ our solar system. It always seems to get overlooked when the mission invitations go out. Spacecraft have been sent to Mercury, Mars, Venus, Saturn and Jupiter. There is even one on its way to non-planet Pluto. But Uranus does not deserve its dull, or comic, reputation. In fact it is one of the most interesting, exciting and downright weird planets we know of.
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With a volume 60 times that of Earth, Uranus is a compressed mass of toxic gases, including methane, ammonia and hydrogen sulphide, surrounding a small rocky core. (...) Circled by 26 small moons, a few faint rings and a weak magnetic field Uranus appears to be tipped over on its side. Every planet has a slight tilt when it spins – it gives us our seasons – but unlike every other planet ∈ the solar system, Uranus rotates on an axis pointing almost directly at the Sun. Something that Fletcher describes as “really weird”.
“Imagine a world where winter lasts 42 Earth years and you don’t see the Sun once during that time,” he says. “You have this situation where the atmosphere isn’t heated for decades and that can lead to some really interesting atmospheric properties.”
Fletcher is part of an international team that believes Uranus has been neglected for too long. This group of scientists and engineers from Europe, the United States and several other nations, including Japan, is working on a $600m mission proposal for the European Space Agency (ESA) with the aim of sending out a probe, within the next 10 years, to discover why Uranus is so odd. The mission will investigate the atmosphere, magnetic field and capture detailed images of this strange world.
Fonte: http://www.bbc.com/future/story/20140822-the-mission-to-an-un-loved-planet. Acesso em 25/08/2014. Adaptado.
Verifique se as sentenças são verdadeiras (V) ou falsas (F). Depois, escolha a opção que apresenta a ordem correta:
( ) Há atualmente uma espaçonave indo em direção a Plutão, que não é considerado um planeta.
( ) Na opinião do autor do texto, o planeta Urânio não deveria ter a reputação negativa que tem.
( ) Diferentemente do que ocorre em outros planetas do Sistema Solar, a atmosfera do planeta Urânio passa anos sem receber luz do sol.
( ) Cientistas e engenheiros de diversas nacionalidades finalizaram um projeto para enviar um sonda espacial para o planeta Urânio daqui a 10 anos.
