阅读理解。阅读下列短文, 从给的四个选项 (a、b、c和d) 中, 选出最佳选项。
blue planets space is not black，but light green，a team of astronomers announced on january 10.they studied the light sent out by 200 000 galaxies.what they found was that the average colour of the universe is a bit greener than turquoise(绿宝石)．
the discovery was part of an attem
