The planets were discovered using NASA's Spitzer Space Telescope, which was able to track how fast each of the planets crossed the star Trappist-l and completed an orbit. From this the

　　research team calculated how far the planets were from their star, and therefore how likely they are to be habitable.

　　NASA's Hubble Space Telescope is already being used to search for atmospheres around the planets. Future telescopes, including the proposed European Extremely Large Telescope and the James Webb Space Telescope, may be powerful enough to discover markers of life, such as oxygen in the atmospheres of exoplanets.

　　Astronomers believe there could be as many as 40 billion potentially habitable worlds in our

　　galaxy, the Milky Way. Prof Zurbuchen said that now was a "gold-rush phase" in the search for

　　these exoplanets.

　　29. What makes the new discovery significant?

　　A. Ample markers of life

　　B. The potential to support life.

　　C. Great distance from Earth.

　　D. The search for extraterrestrial life.

　　30. What helps explore atmospheres around the exoplanets?

　　A. Spitzer Space Telescope.

　　B. Hubble Space Telescope.

　　C. European Extremely Large Telescope.

　　D. James Webb Space Telescope.

　　31. What may be the best title for the text7

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