Scientists for the first time have

Scientists for the first time have found water in the atmosphere of an Earth-like planet orbiting (绕……轨道而行)a distant star. It is the evidence that a key ingredient for life exists beyond our solar system, according to a studypublished in 2019. Water vapor was found in the atmosphere of K2-18b, one of the hundreds of “super-Earths” recorded in a newfield of astronomy that explores the so called exoplanets (系外行星), which are planets that orbit a star other than thesun. In total, more than 4,000 exoplanets of all types and sizes have been found. The latest discovery was reported in research by a team of scientists at University College London (UCL)published in the journal Nature Astronomy. “We found water through the Hubble Space Telescope,” UCLastrophysicist Ingo Waldmann said. It marks the first time that scientists have found water in the atmosphere around asuper-Earth. Angelos Tsiaras, an astronomer at UCL, said the team is working on finding exoplanets whose conditions aresimilar to those on Earth. “But of course its purpose is not to find a place where we could go,” Tsiaras said. “Whilelight from the sun takes several minutes to reach Earth, light from K2- 18b’s star takes a century to reach our planet, soit’s impossible for us to travel there.”“Considering it’s so far away, we don’t really have any other choice but to stay on our own Earth, so it’simportant to make Earth great again rather than looking for another planet to take the place of Earth,” Tsiaras said. Besides the quite long distance separating Earth from K2-18b, there is far more radiation (辐射) on the exoplanetthan on Earth, which diminishes the possibility for life to exist. However, the discovery brings astronomers closer toanswering the fundamental question of how special Earth is in the universe, the scientists said. 27. What did the scientists at UCL find out?A. Life exists on other planets. B. More exoplanets are disappearing. C. Water exists in the atmosphere of an exoplanet. D. Exoplanets are similar to planets in the solar system. 28. What can be learnt about exoplanets?A. K2-18b is the biggest exoplanet. B. Scientists know exoplanets well. C. There are totally 4,000 exoplanets. D. They don’t belong to the solar system. 29. What might Angelos Tsiaras agree with?A. We should protect our earth well. B. We should make full use of solar energy. C. We should study the planets near our earth. D. We should try our best to find earth-like planets. 30. What does the underlined word “diminishes” in the last paragraph mean?A. Raises. B. Decreases. C. Ignores. D. Admits.