Questão 29 - UEFS Caderno 1 2017/1

TEXTO:

[1]   The planet, called Proxima b, orbits Proxima

Centauri — the nearest star to our solar system — and

is about 1.3 times bigger than Earth.

  Because Proxima Centauri radiates much less heat

[5] than the Sun, the planet occupies the “habitable zone”

where temperatures are mild enough to allow liquid

surface water.

  Proxima b is only four light years away from Earth

and Professor Abraham Loeb, from Harvard University,

[10] has raised the possibility of humans one day colonizing

the planet. “The lifetime of Proxima is several trillion years,

almost a thousand times longer than the remaining lifetime

of the Sun,” he said. “Hence, a habitable rocky planet

around Proxima would be the most natural location to

[15] where our civilization could aspire to move after the Sun

will die, five billions years from now.” Proxima b is only

7.5 million kilometers from its parent star and it takes

just 11.2 days to complete one orbit.

  Russian billionaire Yuri Milner is planning to send a

[20] fleet of miniature interstellar probes fitted with cameras

there on a 20-year mission to search for alien life. The

£75m Breakthrough Starshot project, which is backed

by Professor Stephen Hawking, aims to launch the tiny

one-gram “nanocraft” towards Proxima Centauri within

[25] the next two to three decades. “It will take 20 years to

reach Proxima and four more years for the photos to get

back to Earth,” he added.

Disponível em: <news.sky.com/story/new-planet-found-which-huma nscould- colonise-10550245>. Acesso em:12 out. 2016. Adaptado.

The only question to which there is no answer in the text is