At the motion of the earth in its orbit around the sun appears to move among the signs of the zodiac in the course of a , as the moon does over the course of a

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet? the planet started to cool and an atmosphere formed. the planet started to become round and heat up. the planet started to wobble and turned upside down. the planet started to compress rock and form more radioactive elements.