Is it possible for another planet to collide with another?

Is it possible for another planet to collide with another?
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Around our sun? Now? No, the orbits are all too regular and the spaces between planets have been swept clean by near miss gravitational ejections and long past collisions.More than about 3.5 billion years ago when the spaces between orbits still contained many large protoplanetary bodies with very elliptical orbits: yes collisions were very possible.
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As we go from one planet to another planet, how will the mass and weight of a body change?

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Last Answer : As we go from one planet to another planet, how will the mass and weight of a body change?

What is a mobile unmanned vehicle that is used to explore the surface of another planet?

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Last Answer : Mariner 9