Scientists have some new information. They say that there is a ninth planet in our solar system. The planet is 10 times bigger than Earth. It is 20 times farther away from the sun than Earth.
We cannot see the planet, but we can watch how it moves. Experts are looking for the planet. They know that it is there. They must only find it.
Difficult words: solar system (our sun and the 9 planets around it), Earth (our planet), farther (a longer way).
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