The way you would put it to a nine-year-old is to say, "If a meteorite was coming to hit the Earth, how would you figure out if it was going to or not?"
तुम्ही एक ९ वर्षाच्या मुलाला सांगितले कि एक धुमकेतू पृथ्वीला टक्कर देणार आहे तर तो पृथ्विला धडकेल कि नाही हे तुम्ही कसे सांगणार ?