Alien life could be thriving in the same way, DasSarma said.
达斯萨尔马说,外星生命可能会以同样的方式茁壮成长。
"Astronomers have discovered thousands of new extrasolar planets recently and are developing the capacity to see surface biosignatures" in the light reflected from these planets, he told Live Science. There are already ways to detect green life from space, he said, but scientists might need to start looking for purple, too.
他告诉趣味科学网站说,“天文学家最近发现了数千颗新的太阳系外行星,并且正在开发从这些行星反射出的光线中观察表面生物特征的能力”。他说,科学家已经有办法探测太空中的绿色生命,但或许他们还需要开始寻找紫色的生命。
紫色的地球
The idea that the early Earth was purple is not new, DasSarma and his colleagues advanced the theory in 2007. The thinking goes like this: Plants and photosynthesizing algae use chlorophyll to absorb energy from the sun, but they don't absorb green light. That's odd, because green light is energy-rich. Perhaps, DasSarma and his colleagues reasoned, something else was already using that part of the spectrum when chlorophyll photosynthesizers evolved.
关于早期地球是紫色的设想并不新鲜,达斯萨尔马和他的同事们在2007年就提出了这一假设。这种想法是这样的:植物和进行光合作用的藻类利用叶绿素吸收来自太阳的能量,但它们并不吸收绿光。这很奇怪,因为绿光富含能量。达斯萨尔马和他的同事们推断,也许,在叶绿素光合作用生物进化出现的时候,某种使用那部分光谱的其他生物体已经存在了。
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