Answer:
A. The target nucleus split into two nuclei, each with fewer nucleons than the original.
Explanation:
Earth has its own atmosphere. That is one reason all the water that has been on Earth has been recycled through the water cycle. It never leaves Earth’s atmosphere.
The question is looking for "ellipse" and "two" to fill in the blanks.
Strange as it may seem, the object would keep moving, in a straight line and at the same speed, until it came near another object. Its momentum and kinetic energy would never change. It might continue like that for a billion years or more.
Have a look at Newton's first law of motion.
