12 Read. Complete the sentences with the correct form of the verbs in parentheses.
Saturn has always been a fascinating planet. At about 1.2 billion km (746 million mi.)
from Earth, it was the most distant of the worlds recognized by ancient sky watchers.
If they
(study) it the way we are able to today, they
(be) amazed. They
(find) that its
rings consisted of billions of icy particles. They
(discover) that
these rings are extremely thin-only 10 m (33 ft.) thick. And they
(learn) that some of the planet's small moons play an important part in controlling the
orbits and spacing of the rings. If you
(study) Saturn's moons
today, you
(observe) that some of its 62 moons orbit in
opposite directions. You
(see) that some moons even exchange
orbits. Most importantly you
(learn that two of the moons
have the potential for life!
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