If the astronomer studies the Moon,, she will see the craters., If a planet has strong gravity,, it will hold things on its surface., If we measure the diameter of Earth,, we will know its size., If the space probe goes to Mars,, it will send pictures back to Earth., If the Sun’s core is very hot,, it will create a lot of light., If we travel a long distance in the solar system,, we will need to prepare food., If Earth orbits the Sun faster,, the year will become shorter., If scientists study a planet’s matter,, they will learn what it is made of., If a star is very unusual,, astronomers will study it closely., If we explore Mercury’s craters,, we will find out what created them..

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