First observed transiting its parent star in 2011, 55 Cancri e makes a full orbit in just 18 hours, in contrast to Earth’s 365 days. Since it's perilously close in to its sun-like host star, surface temperatures reach an inhabitable 2,150 degrees Celsius. Extremely high temperatures, along with carbon, make perfect conditions for creating diamonds.
Unlike Earth’s chemical make-up, 55 Cancri e has no water and is composed primarily of carbon (graphite and diamond), iron, and silicon carbide. Scientists speculate that about one third of the planet’s mass — the equivalent of the weight of three Earths — is pure diamond.
Science fiction has dreamed of diamond planets for many years. Now it’s amazing that we finally have evidence of its existence in the universe. Located 40 light-year away from Earth, the gemlike planet is clearly visible to the naked eye in the northern constellation Cancer.
| Q：With which statement would the author probably agree? | |
| A. | Many distant planets have compositions similar to those of Earth. |
| B. | Even if humans learn how to travel at the speed of light, the round trip to 55 Cancri e would take 40 years. |
| C. | A single year on 55 Cancri e takes more time than one of Earth’s days. |
| D. | Sadly for people who daydream of a glittering oasis, 55 Cancri e couldn’t support life. |
答案：D <<< 用滑鼠框起來反白，就可以看到答案
- Improviser 文苦工
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精選多益/ 全民英檢中(高)級/ 托福單字片語
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電影《血鑽石 (Blood Diamond) 》預告
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