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Why did Jor-El and Lara send Kal-El away from Krypton?

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Christopher Reeve as Superman in a blue suit with red cape and yellow belt, flying with one arm forward against a dark background in a publicity still from Superman: The Movie. — Superman Christopher Reeve in *Superman* (1978), directed by Richard Donner.

Jor-El and Lara sent their infant son, Kal-El, away from their home world because Krypton was a "doomed planet". To ensure his survival, the scientists placed him into a rocket bound for Earth, where he was eventually found and adopted by Martha and Jonathan Kent.12