The new estimate of how many plantes might fit these conditions comes from studying more that 42,000 stars and identifying suitable worlds orbiting them.The scientists used those numbers to extrapolate(推算) to the rest of the stars that the telescope could not see.
The estimate is rough,the authors admit. If applied to the solar system,it would define as habitable a zone starting as close ot the Sun as Venus and running to as far away as Mars. Neither planet is Earthlike(although either might have been in the distant pase). Using tighter limits the researchers estimate the between 4 and 8 out of every 100 sunlike stars could host an Earth-sized world.These are ones that would take 200 to 400 days to complete a yearly orbit.
Four out of every 100 sunlike stars doesnt sound like a big number. It would mean however that the Milky Way could host more than a billion Earth-sized planets with a chance for life.
16. The Kepler space telescpe has been in service for 15 years
A Right B Wrong C Not mentioned
17.The main task of the Kepler space telescope is to find out planets with similar conditions to Earths.
A Right B Wrong C Not mentioned
18.The planet that could support life might be a little bit smaller than Earth.
A Right B Wrong C Not mentioned
19.The Earth is a planet orbiting in the Suns habitable zone.
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