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The universe may be a safer place for planet earth than astronomers have thought (здесь нет времени для past simple и нет действия в прошлом для past perfect)  a new survey has found (нам важен результат и тут по смыслу не подходит пассивный залог) that there are far fewer dangerous asteroids hurtling through space that  can (тут  вероятность действия и речь не о прошлом)  hit earth and cause widespread devastation. previously, astronomers  had estimated (это действие было совершено до другого действия в прошлом)  that there were between 1,000 and 2,000 asteroids at least a kilometer in diameter that  could (тут возможность в прошлом)  potentially slam into our planet. that meant there was a 1 percent chance of a catastrophic collision with earth in the next million years. based on the findings, researchers from yale university and the jet propulsion laboratory in california  have calculated (здесь нет времени для past simple и нам важен результат самого действия) that the total number of potentially devastating asteroids is about half the earlier estimates - about 700.